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From Quarry to Sculpture: Understanding Provenance, Typologies, and Uses of Khmer Stones | The Metropolitan Museum of Art

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Scientific Research Projects</a></span> <span>/</span><span><a href="/about-the-met/conservation-and-scientific-research/projects/khmer-stones">From Quarry to Sculpture: Understanding Provenance, Typologies, and Uses of Khmer Stones</a></span> </nav> </div> <!-- For header images, section search boxes and search tabs --> <!-- Main content area --> <div class="main-wrapper wrapper" id="main-content"> <div class="row"> <div class="med-hide lrg-c2"></div> <div class="content content-centered"> <h1 class="page-title"> From Quarry to Sculpture: Understanding Provenance, Typologies, and Uses of Khmer Stones </h1> <div class="rich-text z-container"> <p><a href="#Introduction" target="_self">Introduction</a><br> <a href="#Analysis" target="_self">The Analysis of the Collection</a><br> <a href="#Overview" target="_self">An Overview of the Identified Stones</a><br> <a href="#Arenites" target="_self">The Arenites</a><br> <a href="#Graywackes" target="_self">The Graywackes</a><br> <a href=" Material POV#Collection" target="_self">The Collection from a Material Point of View</a><br> <a href=" Survey#2009" target="_self">The 2009 Survey of Khmer Quarries in Siem Reap and Preah Vihear Provinces</a><br> <a href=" from Quarry#Stone" target="_self">The Stone From The Quarry Of Thmâ Anlong</a><br> <a href="#Acknowledgments" target="_self">Acknowledgments</a><br> <a href="#Bibliography" target="_self">Bibliography</a><br> <a href="#Citation" target="_self">Citation</a></p> <hr> <h2><a name="Introduction"></a>Introduction</h2> <p>A comprehensive quantitative petrographic database of sandstones used by the Khmers for sculptural purposes would be a helpful tool for archaeologists, museum curators, and others interested in pursuing research on early stone usage, geologic source, and provenance of Southeast Asian stone materials. Toward that end, the Department of Scientific Research of The Metropolitan Museum of Art, in collaboration with the Department of Asian Art, is promoting the petrographic and geochemical study of Khmer sculptural production of the pre-Angkor (ca. seventh to ninth century) and Angkor (ca. tenth to thirteenth century) periods.</p> <p>More than fifty Khmer sculptures from the Metropolitan Museum collection have been analyzed, together with sculptures from the National Museum of Cambodia and from other Western collections. This corpus of Khmer sculptures, including both well-provenanced and unprovenanced pieces, has been studied by means of minor-destructive and non-destructive analytical techniques (see fig. 1).</p> </div> <section class="image-block image-block--large image-block--text-above-below z-container"> <div class="image-block__image-container"> <img src="/-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from_quarry_sculpture_figure1_khmer_large.jpg?sc_lang=en&amp;h=844&amp;w=1520&amp;la=en&amp;hash=B183D2F925007FA15104C61006811B20" srcset="/-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from_quarry_sculpture_figure1_khmer_large.jpg?as=1&mh=844&mw=1520&sc_lang=en&hash=ADBD96CBC30138AE4DB26ED659DCC7EC 1x, /-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from_quarry_sculpture_figure1_khmer_large.jpg?as=1&mh=1688&mw=3040&sc_lang=en&hash=7BF463A598C106FE86E8428D4BA39B43 2x" class="image-block__image" style="" alt="Portable X-ray fluorescence spectrometry is employed in the non-destructive analysis of stone surfaces." /> </a> </div> <div class="image-block__description rich-text"><p><span class="inline-caption">Fig. 1. Portable X-ray fluorescence spectrometry is employed in the non-destructive analysis of stone surfaces.</span></p></div> </section> <div class="rich-text z-container"> <p>In addition, under memorandums of understanding signed between the Metropolitan Museum and the National Museum of Cambodia, and with the Authority for the Protection and Management of Angkor and the Region of Siem Reap (APSARA) of Cambodia, new sculpture and quarry samples have recently been added to this study, the aim of which is to provide a database of Khmer stone materials that has the potential to develop further with future contributions from scientists at other museums that have holdings of Khmer sculpture.</p> <p>Several scientific works presenting overviews of Khmer stone petrography have been published. Among them, it is worth mentioning the early studies of stone materials of Angkor Wat by Delvert (1963) and Saurin (1954); the studies of the building materials of the Angkor complex by the Japanese research team headed by Etsudo Uchida (see, for instance, Uchida et al. 1998); the survey of about fifty sculptures from the Mus&eacute;e National des Arts Asiatiques&ndash;Guimet collection by Pierre Baptiste, published in 2001 (Baptiste et al., 2001); and the petrographic study of twenty-nine pre-Angkor to post-Angkor sculptures from the National Museum of Cambodia by Janet G. Douglas (Douglas, 2004; Douglas and Sorensen, 2007).</p> <p>Additionally, petrographic descriptions of Cambodian stone sculptures have been published as appendices in special monographs and museum catalogues (see, for instance, Newman, 1997). The authors, though using different classification systems, describe three similar main types of sedimentary rocks (see Table 1).</p> <p>The study of stone materials from the Metropolitan Museum collection is aimed at enlarging the existing database of Khmer stones by adding quantitative petrographic data, which will provide useful insight into the reconstruction of material usage and diffusion during the Khmer empire. Distinctive petrographic characteristics are described, which can be used by scientists and archaeologists in the attribution of sculptures with unknown provenance, and as guidelines for the identification of the most probable sites of material provenance.</p> <table style="width: 100%;" id="tbl1" class="telerik-reTable-4"> <tbody> <tr class="telerik-reTableHeaderRow-4"> <td class="telerik-reTableHeaderEvenCol-4">Author</td> <td class="telerik-reTableHeaderOddCol-4">Adopted rock name</td> <td class="telerik-reTableHeaderEvenCol-4">Composition</td> <td class="telerik-reTableHeaderOddCol-4">Texture</td> </tr> <tr class="telerik-reTableOddRow-4"> <td class="telerik-reTableEvenCol-4" rowspan="3">Saurin 1954</td> <td class="telerik-reTableOddCol-4"><span class="inline-caption">Sandstone from Banteay Srei</span></td> <td class="telerik-reTableEvenCol-4"><span class="inline-caption">Quartz and rare quartzite in abundant clay cement rich in iron oxides (hematite). The color of this sandstone can vary depending on the content of iron oxides.</span></td> <td class="telerik-reTableOddCol-4"><span class="inline-caption">Fine-grained (0.1-0.2 mm), angular grains.</span></td> </tr> <tr class="telerik-reTableEvenRow-4"> <td class="telerik-reTableEvenCol-4"><span class="inline-caption">Green sandstone - Arkose</span></td> <td class="telerik-reTableOddCol-4"><span class="inline-caption">Quartz, plagioclase, biotite often altered to magnetite, muscovite, magnetite and hematite. Quartzite, chert and schists are the main rock fragments. Accessory minerals are zircon, corundum and tourmaline. The cement is argillaceous with abundant chlorite. Calcite is also present as cement.</span></td> <td class="telerik-reTableEvenCol-4"><span class="inline-caption">Fine-grained (0.05-0.15 mm), well sorted, angular grains.</span></td> </tr> <tr class="telerik-reTableOddRow-4"> <td class="telerik-reTableEvenCol-4"><span class="inline-caption">Green-gray sandstone from Ta Keo</span></td> <td class="telerik-reTableOddCol-4"><span class="inline-caption">Quartz, K-feldspars and plagioclase, biotite and muscovite. Together with quartzite, chert and schist, volcanic rock fragments (andesite) are common. Accessory minerals are pyrite, tourmaline and sphene.</span></td> <td class="telerik-reTableEvenCol-4"><span class="inline-caption">Less sorted and fine grained than the Arkose, with micro-conglomeratic texture</span></td> </tr> <tr class="telerik-reTableEvenRow-4"> <td class="telerik-reTableEvenCol-4" rowspan="3"><span class="inline-caption">Delvert 1963</span></td> <td class="telerik-reTableOddCol-4"><span class="inline-caption">Pink sandstone</span></td> <td class="telerik-reTableEvenCol-4"><span class="inline-caption">Monocrystalline quartz in a kaolinite cement.</span></td> <td class="telerik-reTableOddCol-4"><span class="inline-caption">Fine-grained (0.1-0.2 mm), angular grains.</span></td> </tr> <tr class="telerik-reTableOddRow-4"> <td class="telerik-reTableEvenCol-4"><span class="inline-caption">Grey sandstone</span></td> <td class="telerik-reTableOddCol-4"><span class="inline-caption">Quartz, feldspars (sericitized), biotite, muscovite in a chlorite cement. Accessory minerals are iron oxides, epidote, chlorite, sphene and zircon.</span></td> <td class="telerik-reTableEvenCol-4"><span class="inline-caption">Fine-grained (0.05-0.15 mm), well sorted, angular grains.</span></td> </tr> <tr class="telerik-reTableEvenRow-4"> <td class="telerik-reTableEvenCol-4"><span class="inline-caption">Green sandstone</span></td> <td class="telerik-reTableOddCol-4"><span class="inline-caption">Quartz, abundand K-feldspars and plagioclase, altered biotite, muscovite, quartzite, schist and volcanic rock fragments in a chlorite cement.</span></td> <td class="telerik-reTableEvenCol-4"><span class="inline-caption">Medium-grained (0.2-0.6 mm), poorly sorted grains</span></td> </tr> <tr class="telerik-reTableOddRow-4"> <td class="telerik-reTableEvenCol-4" rowspan="3"><span class="inline-caption">Uchida et al. 1998</span></td> <td class="telerik-reTableOddCol-4"><span class="inline-caption">Red sandstone &ndash; Quartz arenite</span></td> <td class="telerik-reTableEvenCol-4"><span class="inline-caption">Quartz with small amount of rock fragments (mainly chert)<br /> Hematite and pyrite as accessory minerals</span></td> <td class="telerik-reTableOddCol-4"><span class="inline-caption">Fine-grained (0.1-0.2 mm) and well sorted</span></td> </tr> <tr class="telerik-reTableEvenRow-4"> <td class="telerik-reTableEvenCol-4"><span class="inline-caption">Gray to yellowish brown sandstone &ndash; Feldspathic arenite</span></td> <td class="telerik-reTableOddCol-4"><span class="inline-caption">Quartz, feldspars, biotite, rock fragments and muscovite<br /> Magnetite, calcite, kaolinite, garnet, epidote, zircon and tourmaline as accessory minerals</span></td> <td class="telerik-reTableEvenCol-4"><span class="inline-caption">Fine- to medium-grained (0.1-0.3 mm) and well sorted</span></td> </tr> <tr class="telerik-reTableOddRow-4"> <td class="telerik-reTableEvenCol-4"><span class="inline-caption">Greenish graywacke &ndash; Feldspathic wacke</span></td> <td class="telerik-reTableOddCol-4"><span class="inline-caption">Feldspars, quartz, rock fragments, biotite and muscovite</span></td> <td class="telerik-reTableEvenCol-4"><span class="inline-caption">Medium-grained (&lt;0.5 mm) and poorly sorted</span></td> </tr> <tr class="telerik-reTableEvenRow-4"> <td class="telerik-reTableEvenCol-4" rowspan="3"><span class="inline-caption">Baptiste et al. 2001</span></td> <td class="telerik-reTableOddCol-4"><span class="inline-caption">Quartz arenite</span></td> <td class="telerik-reTableEvenCol-4"><span class="inline-caption">Quartz (&gt;90%) and accessory micas in a kaolinite cement</span></td> <td class="telerik-reTableOddCol-4"><span class="inline-caption">Well sorted</span></td> </tr> <tr class="telerik-reTableOddRow-4"> <td class="telerik-reTableEvenCol-4"><span class="inline-caption">Arkose</span></td> <td class="telerik-reTableOddCol-4"><span class="inline-caption">Quartz (&lt;60%), feldspars, biotite and muscovite<br /> Epidote, sphene, zircon, pyrite, iron oxides and hydroxides as accessory minerals. Chlorite and illite cement</span></td> <td class="telerik-reTableEvenCol-4"><span class="inline-caption">Variable sorting</span></td> </tr> <tr class="telerik-reTableEvenRow-4"> <td class="telerik-reTableEvenCol-4"><span class="inline-caption">Graywacke</span></td> <td class="telerik-reTableOddCol-4"><span class="inline-caption">Quartz, plagioclase, calcite and chlorite<br /> Chlorite and illite cement</span></td> <td class="telerik-reTableEvenCol-4"><span class="inline-caption">Fine-grained</span></td> </tr> <tr class="telerik-reTableOddRow-4"> <td class="telerik-reTableEvenCol-4" rowspan="3"><span class="inline-caption">Douglas 2004</span></td> <td class="telerik-reTableOddCol-4"><span class="inline-caption">Feldspathic litharenite to litharenite<br /> (sandstone from mixed parent rock source)</span></td> <td class="telerik-reTableEvenCol-4"><span class="inline-caption">Quartz (34%), feldspars (26%) and rock fragments (40%)<br /> Detrital grains from igneous, metamorphic and sedimentary sources</span></td> <td class="telerik-reTableOddCol-4"><span class="inline-caption">Medium-grained, submature with 5% matrix, to coarse-grained, immature with about 20% matrix</span></td> </tr> <tr class="telerik-reTableEvenRow-4"> <td class="telerik-reTableEvenCol-4"><span class="inline-caption">Feldspathic litharenite to litharenite<br /> (sandstone from calcareous mixed parent rock source)</span></td> <td class="telerik-reTableOddCol-4"><span class="inline-caption">Quartz (26%), feldspars (12%) and rock fragments (62%)<br /> High proportion of limestone grains and carbonate cement.</span></td> <td class="telerik-reTableEvenCol-4"><span class="inline-caption">Medium- to coarse-grained</span></td> </tr> <tr class="telerik-reTableOddRow-4"> <td class="telerik-reTableEvenCol-4"><span class="inline-caption">Lithic arkose to feldspathic litharenite<br /> (sandstone from igneous parent rock source)</span></td> <td class="telerik-reTableOddCol-4"><span class="inline-caption">Quartz (28%), feldspars (37%) and rock fragments (35%)<br /> High proportion of igneous rock fragments and fine feldspar microliths and vitreous material in the matrix.</span></td> <td class="telerik-reTableEvenCol-4"><span class="inline-caption">Coarse- to very coarse-grained and immature</span></td> </tr> </tbody> </table> <style id="telerik-reTable-4" type="text/css"> .telerik-reTable-4 { BORDER-BOTTOM: 0px solid; 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PADDING-TOP: 0in } </style> <p class="inline-caption">Table 1.&nbsp;Review of published Khmer stone classifications.</p> </div> <div class="rich-text z-container"> <p><a href="#Introduction" target="_self">BACK TO TOP</a></p> <hr> <h2><a name="Analysis"></a>The Analysis of the Collection</h2> <p>The collection of The Metropolitan Museum of Art covers pre-Angkor and Angkor period productions from Cambodia, but also from Thailand and Vietnam, and includes freestanding sculptures and architectural elements, such as lintels and columns. The sampled Khmer sculptures include the majority of the objects on view in the galleries and in storage. Small fragments of stone have been carefully sampled from areas affected by previous breaks or loss of material, and generally located at the back of arm or leg joints or at the bottom edges of architectural elements (see Fig. 2).</p> </div> <section class="image-block image-block--large image-block--text-above-below z-container"> <div class="image-block__image-container"> <img src="/-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from_quarry_sculpture_figure2_large.jpg?sc_lang=en&amp;h=636&amp;w=1520&amp;la=en&amp;hash=9DC3C69D2F8A5AF74649B9ADB01E7781" srcset="/-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from_quarry_sculpture_figure2_large.jpg?as=1&mh=636&mw=1520&sc_lang=en&hash=C25783FE520A576351E8DF9E1B5465FE 1x, /-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from_quarry_sculpture_figure2_large.jpg?as=1&mh=1272&mw=3040&sc_lang=en&hash=740C207E6F4E244C3FE384EA245A7456 2x" class="image-block__image" style="" alt="Examples of sample location on sculptures from The Metropolitan Museum of Art collection (white arrows)." /> </a> </div> <div class="image-block__description rich-text"><p><span class="inline-caption">Fig 2. Examples of sample location on sculptures from The Metropolitan Museum of Art collection (white arrows).</span></p></div> </section> <div class="rich-text z-container"> <p>When possible, fragments include the exposed surface and the fresh stone interior.<br /> Standard thin sections have been prepared from stone fragments embedded in epoxy resin. For each sample, the maximum number of detrital grains was counted and each grain classified and measured by means of a micrometric eyepiece using a polarized light microscope. Key petrographic parameters according to Pettijohn (1975) as well as the grain size distribution and key textural parameters were derived by means of computer software modified after Balsillie et al (2002).</p> <p><a href="#Introduction" target="_self">BACK TO TOP</a></p> <hr /> <h2><a name="Overview"></a>An Overview of the Identified Stones</h2> <p>All the analyzed stone samples from the Khmer collection at the Metropolitan are sandstones&mdash;clastic sedimentary rocks composed of a framework of sand-size grains set in a silty or clayey matrix and united by a cementing material. Many schemes of sandstone classification exist, and none of them is universally accepted by scientists. For the purposes of this review, we decided to adopt the schemes proposed by Pettijohn (1954) and Gazzi-Dickinson (Gazzi 1966; Dickinson 1970).</p> <p>The first author divides sandstones in two main groups: those with less than 15% of matrix, called arenites, and those with more than 15% of matrix, called wackes. Despite the criticisms, this scheme is used here to favor a sharp visualization of the collection from a material point of view. According to this scheme, 57% of the collection can be classified as arenites while 43% are graywacke, a term used in this circumstance in its general sense of dark gray, immature sandstone with significant matrix content. By using the Gazzi-Dickinson classification, it is possible to detail further the nature of the stones present in the collection on the basis of the detrital grain composition. In this review we will focus on two types of arenites and two graywackes, which together make up 90% of the studied collection.</p> </div> <section class="image-block image-block--large image-block--text-above-below z-container"> <div class="image-block__image-container"> <img src="/-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from_quarry_sculpture_figure3_large.jpg?sc_lang=en&amp;h=1346&amp;w=1520&amp;la=en&amp;hash=627B22B472BB2D9248B352A9B04C7A06" srcset="/-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from_quarry_sculpture_figure3_large.jpg?as=1&mh=1346&mw=1520&sc_lang=en&hash=733978D3226A063667E4E8E50879CE03 1x, /-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from_quarry_sculpture_figure3_large.jpg?as=1&mh=2692&mw=3040&sc_lang=en&hash=4C158F3CD1026FCAF25549AC728892EA 2x" class="image-block__image" style="" alt="Compositional classification of the sculptures from the Metropolitan Museum collection according to Gazzi-Dickinson, with highlights indicating the fields of: a) quartz arenite; b) feldpathic arenite; c) graywacke rich in metamorphic, volcanic, and sedimentary rock fragments; d) graywacke rich in volcanic rock fragments; e) very fine, feldspar-rich arenite used for Baphuon and Angkor Wat style sculptures." /> </a> </div> <div class="image-block__description rich-text"><p><span class="inline-caption">Fig 3. Compositional classification of the sculptures from the Metropolitan Museum collection according to Gazzi-Dickinson, with highlights indicating the fields of: a) quartz arenite; b) feldpathic arenite; c) graywacke rich in metamorphic, volcanic, and sedimentary rock fragments; d) graywacke rich in volcanic rock fragments; e) very fine, feldspar-rich arenite used for Baphuon and Angkor Wat style sculptures.</span></p></div> </section> <div class="rich-text z-container"> <p><a href="#Introduction" target="_self">BACK TO TOP</a></p> <hr /> <h2><a name="Arenites"></a>The Arenites</h2> <p>The first arenite is classified as feldspathic arenite. It contains sub-rounded to angular, fine, and moderately well-sorted grains cemented predominantly by chlorite. Thin sections reveal a laminated structure with evident compaction causing pressure-solution phenomena and plastic deformation of micas and sedimentary rock fragments (see fig. 4a). Mono-, poly- and microcrystalline quartz are the most abundant framework grains. Feldspar is mostly plagioclase, while alkali feldspar is generally subordinate. Rock fragments are represented by chert, quartzite, phyllite, micaceous schist, siltstone, shale and intermediate to basic volcanic rocks, suggesting a mixed provenance influenced by a strong metamorphic source. Micas and detrital chlorite are present as flakes bent between the framework grains. The heavy mineral fraction comprises mostly hematite, magnetite, epidote, garnet, ilmenite, titanite, apatite, zircon and rutile.</p> <p>The second arenite is classified as quartz arenite (see figs. 4b, 4c). It has very fine to medium, moderately well-sorted detrital grains. The framework grains are mostly composed of sub-rounded to rounded, mono- and microcrystalline quartz showing incipient quartz overgrowth and kaolinite cementation. Other accessory minerals are altered feldspar, which in some samples can reach 20% of the total framework, muscovite flakes, and layered opaque minerals, mostly represented by ilmenite and fine-grained iron oxides. The rare rock fragments include phyllite, siltstone, mudstone, and volcanic rocks. The heavy mineral fraction is poorly represented. In some cases, a diffuse film of hematite coats the grains and the interstices, and is responsible for a pink to reddish coloration of the stone.</p> </div> <section class="image-block image-block--large image-block--text-above-below z-container"> <div class="image-block__image-container"> <img src="/-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from_quarry_sculpture_figure4_large.jpg?sc_lang=en&amp;h=1016&amp;w=1520&amp;la=en&amp;hash=335A494A226C940C215DE6515B23E25F" srcset="/-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from_quarry_sculpture_figure4_large.jpg?as=1&mh=1016&mw=1520&sc_lang=en&hash=7D77B89A5BEE654ED18E9B7A591C499B 1x, /-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from_quarry_sculpture_figure4_large.jpg?as=1&mh=2032&mw=3040&sc_lang=en&hash=C847B96FE7294F69B1FD6D7FF1386371 2x" class="image-block__image" style="" alt="Micrographs (crossed polars) showing overall composition and texture of: a) feldspathic arenite; b) and c) fine and medium quartz arenite; d) and e) graywacke rich in rock fragments showing different amount of calcite cement; and f) graywacke rich in volcanic rock fragments." /> </a> </div> <div class="image-block__description rich-text"><p><span class="inline-caption">Fig 4a-f. Micrographs (crossed polars) showing overall composition and texture of: a) feldspathic arenite; b) and c) fine and medium quartz arenite; d) and e) graywacke rich in rock fragments showing different amount of calcite cement; and f) graywacke rich in volcanic rock fragments.</span></p></div> </section> <div class="rich-text z-container"> <p><a href="#Introduction" target="_self">BACK TO TOP</a></p> <hr /> <h2><a name="Graywackes"></a>The Graywackes</h2> <p>The studied graywackes are compact, fine-grained and immature sandstone with a variable content of quartz, feldspar, and lithic fragments. Two main types are herein presented, which differ for the nature and amount of rock fragments present.</p> <p>The first typology of graywacke is characterized by abundant rock fragments of volcanic, metamorphic, and sedimentary origin, and by abundant secondary calcite. Grains are sub-rounded to very angular, and poorly sorted (see Figs. 4d, 4e). Quartz is present in mono- and polycrystalline varieties, as well as chert and rare quartzite grains. Feldspar grains are predominant plagioclase and alkali feldspar. Feldspar is often altered to sericite, while calcite replacement of feldspars, as well as of quartz and lithic fragments, is abundant. The content in muscovite and biotite can vary up to 6% of the total framework, with biotite generally prevailing over muscovite. Accessory minerals include clinopiroxene, epidote, apatite, zircon,&nbsp; magnetite, titanite, ilmenite, rutile, iron oxides, and detrital chlorite flakes. Rock fragments content varies widely from 15% to 50%, but is generally high and reflects a metamorphic-volcanic provenance. Metamorphic rock fragment are phyllite, micaceous schist, and rare chlorite schist. Volcanic rock fragments have variable dimensions, from a few tenths of microns to up to one millimeter. They consist of andesitic to rhyolitic volcanic rock fragments in different proportions. Sedimentary rock fragments are less abundant, and include mostly very fine-grained argillite and shale. The matrix is composed of a fine-grained clay-sized assemblage of illitic composition, with subordinate calcite, chlorite, quartz, iron oxides, and heavy minerals. Close observation can reveal frequent pseudomatrix resulting from the breakdown of less competent volcanic and sedimentary lithic fragments. Calcite is present as interstitial cement, filling pore space together with chlorite, and abundantly replaces detrital grains of quartz, feldspar, and rock fragments.</p> <p>The second identified graywacke is generally coarser and better sorted than other studied wackes (see fig. 4f). The matrix is abundant and rich in small feldspar laths. The framework is characterized by a relatively high proportion of feldspar grains (F=48&plusmn;0.6%) and rock fragments (L=31&plusmn;3%). The most distinctive feature is the presence of abundant igneous intermediate to basic brittle volcanic rock fragments (up to 90% of the entire lithic fraction), which easily break down into pseudomatrix. Albitized feldspar and hornblende are also distinctive of this particular sandstone (Douglas and Sorenson, 2007; Car&ograve; and Douglas, 2013). The relatively fresh volcanic grains suggest that the sediment underwent little transport after erosion from a preeminently volcanic source rocks.</p> <p><a href="#Introduction" target="_self">BACK TO TOP</a></p> <hr /> <h2><a name="Collection Material POV"></a>The Collection from a Material Point of View</h2> <p>The petrographic characterization of the stone materials sheds new light on the Khmer collection in The Metropolitan Museum of Art. The study reveals that it is possible to group the sculptures according to strong petrographic similarities, while the integration of stylistic considerations and the comparison with published petrographic data about stone usage in Cambodia help to contextualize this result. The entire corpus of pre-Angkor sculptures (ca. seventh&ndash;ca. ninth century), characterized by a diversity of styles and iconographies, is unified by similar stone materials (see fig. 5).</p> </div> <section class="image-block image-block--large image-block--text-above-below z-container"> <div class="image-block__image-container"> <img src="/-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from_quarry_sculpture_figure5_large.jpg?sc_lang=en&amp;h=1203&amp;w=1520&amp;la=en&amp;hash=B98A12B371EB30DCF13DF88815CBDCAA" srcset="/-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from_quarry_sculpture_figure5_large.jpg?as=1&mh=1202&mw=1520&sc_lang=en&hash=EFBA41B27765AD74F52E732DB4972C6D 1x, /-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from_quarry_sculpture_figure5_large.jpg?as=1&mh=2404&mw=3040&sc_lang=en&hash=A41507ACD55057E269C7FCFA40B0A779 2x" class="image-block__image" style="" alt="The collection classified according to textural and compositional characters of the stone material. For each stone field, examples of Khmer sculpture production from The Metropolitan Museum of Art are given." /> </a> </div> <div class="image-block__description rich-text"><p><span class="inline-caption">Fig. 5. The collection classified according to textural and compositional characters of the stone material. For each stone field, examples of Khmer sculpture production from The Metropolitan Museum of Art are given. See figure 3 for legend.</span></p></div> </section> <div class="rich-text z-container"> <p>These early Khmer deities, mostly originating from the southern provinces of Cambodia, are carved from graywackes that display a generally well-preserved, dark grayish to dark greenish, sometimes highly polished surface. This sandstone was rarely used for buildings, although a similar type of stone has been found in the early sanctuary of Ta Keo, built in the late tenth to early eleventh century.</p> <p>Conversely, the feldspathic arenite is characteristic of the Angkor decorative statuary, such as guardian deities and lions flanking the main approaches to the sanctuaries and is consistent with a similar stone described by other authors (Delvert, 1963; Uchida et al, 1998; Baptiste et al, 2001; Douglas, 2004). This lithotype, which has also been called grey or green sandstone, arkose, or gray to yellowish brown sandstone, is occurring extensively in architectural elements and stone blocks of the Angkor period (Delvert, 1963; Uchida et al, 1995), and has been also identified in most of the decorative sculptures of Angkor styles collected in the Mus&eacute;e Guimet (Baptiste et al, 2001) and at the National Museum of Cambodia (Douglas, 2004). This stone, which constitutes the main subhorizontal tablelands of Northern Cambodia, was the preferred building material during the highly centralized Angkor kingdom.</p> <p>According to the existing data, the stone used for the images of deities placed inside the sanctuaries continued to be different from building and decorative stone material also during the Angkorian period. During the early stages of the Angkor empire, sculptures in the styles of Kulen (800&ndash;875), Preah Ko (875&ndash;900), and Bakheng (900&ndash;925) were carved from the same graywacke as was used during the pre-Angkor period, while some sculptures in the style of Banteay Srei (ca. 976) were carved from a peculiar green to bluish graywacke. According to the existing petrographic data, Baphuon and Angkor Wat-style sculptures of reduced size were specifically carved from a very fine, compact, feldspar-rich sandstone (see fig.3). A specific role in the Angkor sculptural production is played by a volcanic-rich graywacke. This sandstone, markedly immature and rich in volcanic rock fragments, was predominantly used during the reign of Jayavaraman VII for Bayon style statuary (ca. 1180&ndash;ca. 1230) (see fig. 5) (Douglas and Sorenson, 2007; Car&ograve; and Douglas, 2013).</p> <p>Finally, quartz arenite of different color and grain size is found predominantly in decorated architectural elements of pre-Angkor and Angkor period. This result is in agreement with the occurrences found in the Mus&eacute;e Guimet collection where this stone is used in architectural elements, lintels and columns of different periods (Baptiste et al, 2001). According to these data, this particular lithotype represents the favorite stone material for the architectural element of intricate details. In this case, the choice of a specific stone seems to have been influenced mostly by technical motivations rather than geographical or historical reasons.</p> <p><a href="#Introduction" target="_self">BACK TO TOP</a></p> <hr /> <h2><a name="2009 Survey"></a>The 2009 Survey of Khmer Quarries in Siem Reap and Preah Vihear Provinces</h2> <p>A field trip to Cambodia was organized in January 2009 in cooperation with APSARA Authority to acquire and analyze rock samples from documented quarries in the provinces of Siem Reap and Preah Vihear, Northern Cambodia (see fig. 6). Jurassic sandstones constitute the main sub-horizontal tablelands of Northern Cambodia. The Khorat Plateau in the north, the Phnom Kulen in the south, and the Tb&ecirc;ng Mountain in the east are the broadest outcrops of these Mesozoic sedimentary rocks in the considered area. These sandstone outcrops also constitute numerous mesas and buttes scattered in the Quaternary sediments and are frequently exposed along the riverbeds of seasonal streams in Siem Reap and in Preah Vihear provinces (see fig. 7).</p> </div> <section class="image-block image-block--large image-block--text-above-below z-container"> <div class="image-block__image-container"> <img src="/-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from_quarry_sculpture_figure6_large.jpg?sc_lang=en&amp;h=1061&amp;w=1520&amp;la=en&amp;hash=B951735CE58C467ACD572F59F1727E12" srcset="/-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from_quarry_sculpture_figure6_large.jpg?as=1&mh=1060&mw=1520&sc_lang=en&hash=7522016B29B91D39CCE8DB70822053F5 1x, /-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from_quarry_sculpture_figure6_large.jpg?as=1&mh=2120&mw=3040&sc_lang=en&hash=C0E8D224D7F146CAC1FADA03D2870231 2x" class="image-block__image" style="" alt="Schematic map of Siem Reap and Preah Vihear provinces with the major elevated areas highlighted." /> </a> </div> <div class="image-block__description rich-text"><p><span class="inline-caption">Fig. 6. Schematic map of Siem Reap and Preah Vihear provinces with the major elevated areas highlighted.</span></p></div> </section> <section class="image-block image-block--large image-block--text-above-below z-container"> <div class="image-block__image-container"> <img src="/-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from_quarry_sculpture_figure7_large.jpg?sc_lang=en&amp;h=1115&amp;w=1520&amp;la=en&amp;hash=C2BFAEDD5A858AE11898A446F7DB6C95" srcset="/-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from_quarry_sculpture_figure7_large.jpg?as=1&mh=1114&mw=1520&sc_lang=en&hash=90E5AA37237B61865CC6BCDA9C04DEFD 1x, /-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from_quarry_sculpture_figure7_large.jpg?as=1&mh=2228&mw=3040&sc_lang=en&hash=5FE9AF49249148A3BF94BB5203181C9E 2x" class="image-block__image" style="" alt="Schematic geological map of Siem Reap and Preah Vihear provinces, with location of the abandoned quarries and major Khmer archeological sites. Modified after: United Nations, 1993." /> </a> </div> <div class="image-block__description rich-text"><p><span class="inline-caption">Fig. 7. Schematic geological map of Siem Reap and Preah Vihear provinces, with location of the abandoned quarries and major Khmer archeological sites. Modified after: United Nations, 1993.</span></p></div> </section> <div class="rich-text z-container"> <p>These Jurassic sedimentary units, notably the Lower-Middle Jurassic sediments known as Red Terrain (<em>Terrain Rouge</em>) and Upper Jurassic conglomerates and sandstones known as Upper Sandstones (<em>Gr&egrave;s Sup&eacute;rieures</em>), are thought to have provided much of the building and sculptural material in the area during the whole Khmer empire, although Triassic formations have also been exploited for early statuary and building materials (Delvert, 1963; Uchida et al., 1995; Baptiste et al., 2001; Douglas, 2004).</p> <p>Evidence of multiple episodes of quarrying is present near Beng Mealea at the foot of Phnom Kulen and in the riverbed of the Mealea River, where Lower&ndash;Middle Jurassic sandstones are exposed in horizontal layers (Delvert, 1963). No other quarry remains have yet been documented in Siem Reap province, but previous studies of Khmer stone material suggest that other sources have been exploited through time, from both the Lower and Upper Jurassic units (Delvert, 1963; Uchida et al., 1995, 1996; Uchida and Maeda, 1998; Uchida and Ando, 2001; Douglas, 2004). In Koh Ker, Preah Vihear province, rock carvings on a sandstone outcrop known as Ang Khna are thought to be realized on the vertical surfaces of an abandoned quarry (Jacques and Lafond, 2004). Moriai (2002) reports an important pit quarry in a riverbed about eight kilometers north of Koh Ker, where massive sandstone monoliths that are five meters long are still present on the ground, while in a recent fieldtrip we identified at least two other quarries and multiple sandstone outcrops with similar attitudes scattered in the area.</p> <p><a href="#Introduction" target="_self">BACK TO TOP</a></p> <hr /> <h2><a name="Stone from Quarry"></a>The Stone from the Quarry of Thm&acirc; Anlong</h2> <p>Lower&ndash;Middle Jurassic Red Terrain is widely distributed in northern Cambodia, while it is absent in the central and southern areas of the country (see fig. 7). This sequence mostly occurs in isolated outcrops and comprises conglomerates, sandstones, and siltstones of sub-continental origin that resulted from the massive deposition following the regional Indosinian Orogeny of the Late Triassic period.</p> <p>In northern Cambodia, this Jurassic unit is covered by thin, unconsolidated quaternary deposits in the form of older and younger alluvium. As a consequence, this sandstone is typically exposed in numerous riverbeds in Siem Reap and Preah Vihear provinces (Delvert, 1963; Moriai, 2001; Jacques and Lafond, 2004).</p> <p>Samples from the Lower&ndash;Middle Jurassic continental unit were collected from a quarry located in the commune of Beng Mealea, forty-five kilometers east of Angkor (see fig. 8). This site comprises two quarry sites, locally known as Thm&acirc; Anlong (see fig. 8) and Veal Vong. Together with O Thm&acirc; Dap and Phnom Bei, these sites form a well-known vast quarrying district in the Kulen area (Delvert, 1963). The sandstone is exposed in an area that shows remains of ancient open quarrying near the foothills of Phnom Kulen, two kilometers west of O Thm&acirc; Dap. The remains of the quarry suggest that stone blocks, about one meter in height, were removed with chisels or picks following the horizontal bedding of the sandstone terraces (see fig. 9). These field evidences might find a match in a scene depicted on the bas-relief of the southern gallery of the Bayon temple (see fig.10), in which workers are shown chiseling and wedging materials from the ground (Higham, 2002).</p> </div> <section class="image-block image-block--large image-block--text-above-below z-container"> <div class="image-block__image-container"> <img src="/-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from_quarry_sculpture_figure8_large.jpg?sc_lang=en&amp;h=1239&amp;w=1520&amp;la=en&amp;hash=F1F23F6BF97DD4BB1A822D80A7148C1F" srcset="/-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from_quarry_sculpture_figure8_large.jpg?as=1&mh=1238&mw=1520&sc_lang=en&hash=8DFDCD902EFB14897916FD4C67B35E3E 1x, /-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from_quarry_sculpture_figure8_large.jpg?as=1&mh=2476&mw=3040&sc_lang=en&hash=10F119296DB66028F11097C00957EB13 2x" class="image-block__image" style="" alt="A section of the extensive quarry of Thmâ Anlong in Siem Reap province." /> </a> </div> <div class="image-block__description rich-text"><p><span class="inline-caption">Fig. 8. A section of the extensive quarry of Thm&acirc; Anlong in Siem Reap province.</span></p></div> </section> <section class="image-block image-block--large image-block--text-above-below z-container"> <div class="image-block__image-container"> <img src="/-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from-quarry-to-sculpture_khmer-stones_figure9_large.jpg?sc_lang=en&amp;h=2316&amp;w=1520&amp;la=en&amp;hash=54FE8767DA67B69B16D7C32E4B6DA8C1" srcset="/-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from-quarry-to-sculpture_khmer-stones_figure9_large.jpg?as=1&mh=2316&mw=1520&sc_lang=en&hash=D23CA360097CDEA28F6223385EEBB6A4 1x, /-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from-quarry-to-sculpture_khmer-stones_figure9_large.jpg?as=1&mh=4632&mw=3040&sc_lang=en&hash=14609F1607F4FB5392E2AED2F3FFE3B8 2x" class="image-block__image" style="" alt="Evidence of chiseling found on the quarry surface." /> </a> </div> <div class="image-block__description rich-text"><p><span class="inline-caption">Fig. 9. Evidence of chiseling found on the quarry surface.</span><br /></p></div> </section> <section class="image-block image-block--large image-block--text-above-below z-container"> <div class="image-block__image-container"> <img src="/-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from_quarry_sculpture_figure10_large.jpg?sc_lang=en&amp;h=1023&amp;w=1520&amp;la=en&amp;hash=78A01124063DBA074CF29D59F573F05B" srcset="/-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from_quarry_sculpture_figure10_large.jpg?as=1&mh=1022&mw=1520&sc_lang=en&hash=EC3B20E3468146626528939D98042055 1x, /-/media/images/about-the-met/conservation-and-scientific-research/projects/project-folders/archived-objects-conservation/from-quarry-to-sculpture-khmer-stones-zodiac/from_quarry_sculpture_figure10_large.jpg?as=1&mh=2044&mw=3040&sc_lang=en&hash=69A130042497BEBCF2A8C39318F33DE6 2x" class="image-block__image" style="" alt="This bas-relief from the south gallery of Bayon temple (ca. twelfth century) might depict Khmers working in a stone quarry (Higham, 2002). Scenes describing the transportation and levering of stone blocks are also carved in other galleries of the same temple." /> </a> </div> <div class="image-block__description rich-text"><p><span class="inline-caption">Fig. 10. This bas-relief from the south gallery of Bayon temple (ca. twelfth century) might depict Khmers working in a stone quarry (Higham, 2002). Scenes describing the transportation and levering of stone blocks are also carved in other galleries of the same temple.</span></p></div> </section> <div class="rich-text z-container"> <p>This quarry is characterized by feldspathic arenites, according to the Gazzi-Dickinson classification, or arkosic arenites according to Pettijohn. The framework of this sandstone is composed of very fine to fine, moderately well-sorted, sub-angular to rounded grains, which show an evident laminated structure. In both of the samples, grains are well packed and frequently show pressure-solution phenomena and plastic deformation, the latter mostly affecting rock fragments and micas. The sandstone is cemented by a combination of chlorite and calcite, while quartz and feldspar partial overgrowths are also frequent.</p> <p>Mono- and polycrystalline quartz is the most abundant fraction, followed by plagioclase and alkali feldspar. The rock fragment fraction composes about five percent of the entire framework volume and is represented by volcanic, metamorphic, and sedimentary rocks. The heavy mineral fraction is mostly represented by opaque hematite, magnetite, epidote, garnet, ilmenite, titanite, apatite, zircon and rutile. Occasional detrital chlorite flakes have been found.</p> <p>The collected data are in agreement with other published studies (Delvert, 1963, Uchida et al., 1998; Kučera et al., 2008), and confirm the affinity between the stone used for the construction of the Angkor temples and the litotypes exposed at the eastern foothill of Kulen Mountain.</p> <p><a href="#Introduction" target="_self">BACK TO TOP</a></p> <hr /> <h2><a name="Acknowledgments"></a>Acknowledgments</h2> <p>This research is supported by an Andrew W. Mellon Fellowship.</p> <p>Several staff members from other departments at The Metropolitan Museum of Art continue to contribute their knowledge, comments, and suggestions to this project, including John Guy, Curator of South and Southeast Asian Art, Kurt Behrendt, Assistant Curator, and Donna Strahan, Conservator at the Sherman Fairchild Center for Object Conservation.</p> <p>The cooperation of several people and institutions in Cambodia has also made this project possible. We are grateful to the Ministry of Culture, particularly H. E. Chuch Phoeurn, Secretary of State Culture and Fine Arts; at the Apsara Authority, H. E. Bun Narith, Director-General, and H. E. Khun Neay Khuon, Deputy Director-General; at the National Museum of Cambodia, Mr. Hab Touch, Director, and Mr. Bertrand Porte, EFEO; and at Apsara Authority, Mr. Im Sokrithy.</p> <p>Janet Douglas, Conservation Scientist at the Department of Conservation and Scientific Research of the Freer Gallery of Art / Arthur M. Sackler Gallery, Smithsonian Institution, strictly cooperates in the project by sharing knowledge, data, and samples.</p> <p>Special thanks are due to Sieng Sotham, Director of the Department of Geology, Ministry of Industry, Mines, and Energy in Phnom Penh.</p> <p><a href="#Introduction" target="_self">BACK TO TOP</a></p> <hr /> <h2><a name="Bibliography"></a>Bibliography</h2> <p>Baptiste, P., Chevillot, C., Bouquillon, A., Pag&egrave;s, S., Leclaire, A., Recourt, P., 2001. "La restauration des sculptures khm&egrave;res du mus&egrave;e Guimet," <em>Techn&egrave;</em>, 13&ndash;14, 131&ndash;140.</p> <p>Car&ograve;, F., and Douglas, J. G., 2013. "Nature and provenance of the sandstone used for Bayon style sculptures produced during the reign of Jayavarman VII." <em>Journal of Archaeological Science</em>, 40/1, 723&ndash;734.</p> <p>Delvert, J., 1963. "Recherches sur l&rsquo;erosion des gr&egrave;s des monuments d&rsquo;Angkor." <em>Bulletin de l&rsquo;&Eacute;cole fran&ccedil;aise d&rsquo;Extr&ecirc;me-Orient</em>, 51/2, 453&ndash;534.</p> <p>Dickinson, W. R., 1970. "Interpreting detrital modes of graywacke and arkose." <em>Journal of Sedimentary Petrology</em>, 40, 695&ndash;707.</p> <p>Douglas, J. G., 2004. "Stone materials used in Khmer sculpture from the National Museum of Cambodia." <em>UDAYA: Journal of Khmer Studies</em>, 5, 5&ndash;18.</p> <p>Douglas, J. G., and Sorensen, S., 2007. "Mineralogical Characteristics of Khmer Stone Sculptures in the Bayon Style." In: Douglas, J. D., Jett, P. and Winter, J. (Eds), <em>Scientific Research on the Sculptural Arts of Asia, Proceedings of the Third Forbes Symposium at the Freer gallery of Art, London</em>, 115&ndash;124.</p> <p>Gazzi, P., 1966. "Le arenarie del flysch sopracretaceo dell&rsquo;Appennino modenese: correlazioni con il Flysch di Monghidoro." <em>Mineralogica and Petrographica Acta</em>, 16, 69&ndash;97.</p> <p>Higham, C., 2002. <em>Early Cultures of Mainland Southeast Asia</em>. River Books: Thailand.</p> <p>Kučera, J., Nov&aacute;k, J.K., Kranda, K., Poncar, J., Krausov&aacute;, I., Soukal, L., Cunin, O., Lang, M., 2008. "INAA and petrological study of sandstones from the Angkor monuments." <em>Journal of Radioanalytical and Nuclear Chemistry</em>, 278, 229-306.</p> <p>Newman, R., 1997. "Petrographic Analysis." In: Woodward H. M., Jr. (Ed), <em>The Sacred Sculpture of Thailand: The Alexander B. Griswold Collection, The Walters Art Gallery</em>, University of Washington Press, 261&ndash;265.</p> <p>Pettijohn, F. J., 1975. <em>Sedimentary Rocks</em>, 3rd ed. Harper and Row, New York.</p> <p>Saurin, E. 1954. "Quelques remarques sur le gr&egrave;s d&rsquo;Angkor." <em>Bulletin de l&rsquo;&Eacute;cole fran&ccedil;aise d&rsquo;Extr&ecirc;me-Orient</em>, 46/2, 619&ndash;634.</p> <p>Uchida, E., Ogawa, Y., Hirari, K.,1995. "Petrology." In: Nakagawa, T. (Ed.), <em>Annual Report on the Technical Survey of Angkor Monuments</em>. Japan International Cooperation Center, Japan, 353&ndash;362.</p> <p>Uchida, E., Ogawa, Y., Nakagawa, T., 1998. "The stone materials of the Angkor monuments, Cambodia. The magnetic susceptibility and the orientation of the bedding plane of the sandstone." <em>Journal of Mineralogy Petrology and Economic Geology</em>, 98, 411&ndash;426.</p> <p>United Nations, 1993. <em>Economic and Social Commission for Asia and the Pacific, Atlas of Mineral Resources of the Escap Region</em>, Vol. 10, "Cambodia," Explanatory Brochure. United Nations, New York, 1993.</p> <p><a href="#Introduction" target="_self">BACK TO TOP</a></p> <hr /> <h2><a name="Citation"></a>Citation</h2> <p>Federico Car&ograve;, "From Quarry to Sculpture: Understanding Provenance, Typologies, and Uses of Khmer Stones." New York: The Metropolitan Museum of Art, 2000&ndash;, http://www.metmuseum.org/research/conservation-and-scientific-research/scientific-research/khmer-stones (June 2009, updated January 2014)</p> </div> </div> <div class="med-hide lrg-c2"></div> </div> </div> <!-- end main content area--> <!-- Footer --> <footer class="global-footer"> <section class="global-footer__locations"> <div class="global-footer__logo"> <a title="Homepage" href="/"> <svg xmlns="http://www.w3.org/2000/svg" width="40" height="40" viewBox="0 0 40 40"> <path id="MetLogo_40x40tuned.svg" fill="currentColor" 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