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class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">hide</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Rock in walls of an area with geologic activity</div> <p><b>Wall rock</b> is the rock that constitutes the wall of an area undergoing geologic activity. Examples are the rock along the neck of a <a href="/wiki/Volcano" title="Volcano">volcano</a>, on the edge of a <a href="/wiki/Pluton_(geology)" class="mw-redirect" title="Pluton (geology)">pluton</a> that is being emplaced, along a fault plane, enclosing a mineral deposit, or where a <a href="/wiki/Vein_(geology)" title="Vein (geology)">vein</a> or <a href="/wiki/Dike_(geology)" title="Dike (geology)">dike</a> is being emplaced. </p><p>In volcanoes, wall rock can often become broken off the wall and incorporated into the erupted <a href="/wiki/Volcanic_rock" title="Volcanic rock">volcanic rock</a> as <a href="/wiki/Xenolith" title="Xenolith">xenoliths</a>. These xenoliths are important to <a href="/wiki/Geologist" title="Geologist">geologists</a> because they can come from rock units that are otherwise not exposed at the Earth's surface. </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wall_rock&action=edit&section=1" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Country_rock_(geology)" title="Country rock (geology)">Country rock (geology)</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wall_rock&action=edit&section=2" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a rel="nofollow" class="external text" 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href="/wiki/River_delta" title="River delta">delta</a></li> <li><a href="/wiki/River_mouth" title="River mouth">mouth</a></li></ul></li> <li><a href="/wiki/Strait" title="Strait">Strait</a></li> <li><a href="/wiki/Swamp" title="Swamp">Swamp</a></li> <li><a href="/wiki/Valley" title="Valley">Valley</a></li> <li><a href="/wiki/Waterfall" title="Waterfall">Waterfall</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Glacial_landform" title="Glacial landform">Glacial</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Ar%C3%AAte" title="Arête">Arête</a></li> <li><a href="/wiki/Cirque" title="Cirque">Cirque</a></li> <li><a href="/wiki/Esker" title="Esker">Esker</a></li> <li><a href="/wiki/Fjord" title="Fjord">Fjord</a></li> <li><a href="/wiki/Glacier" title="Glacier">Glacier</a></li> <li><a href="/wiki/Ice_field" title="Ice field">Ice field</a></li> <li><a href="/wiki/Tunnel_valley" title="Tunnel valley">Tunnel valley</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Coastal_geography" title="Coastal geography">Oceanic and<br /> coastal landforms</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Atoll" title="Atoll">Atoll</a></li> <li><a href="/wiki/Bay" title="Bay">Bay</a></li> <li><a href="/wiki/Cape_(geography)" title="Cape (geography)">Cape</a></li> <li><a href="/wiki/Channel_(geography)" title="Channel (geography)">Channel</a></li> <li><a href="/wiki/Coast" title="Coast">Coast</a></li> <li><a href="/wiki/Continental_shelf" title="Continental shelf">Continental shelf</a></li> <li><a href="/wiki/Coral_reef" title="Coral reef">Coral reef</a></li> <li><a href="/wiki/Estuary" title="Estuary">Estuary</a></li> <li><a href="/wiki/Island" title="Island">Island</a></li> <li><a href="/wiki/Isthmus" title="Isthmus">Isthmus</a></li> <li><a href="/wiki/Lagoon" title="Lagoon">Lagoon</a></li> <li><a href="/wiki/Mid-ocean_ridge" title="Mid-ocean ridge">Mid-ocean ridge</a></li> <li><a href="/wiki/Oceanic_trench" title="Oceanic trench">Oceanic trench</a></li> <li><a href="/wiki/Peninsula" title="Peninsula">Peninsula</a></li> <li><a href="/wiki/Seamount" title="Seamount">Seamount</a></li> <li><a href="/wiki/Volcanic_island" title="Volcanic island">Volcanic island</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Volcanic</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Caldera" title="Caldera">Caldera</a></li> <li><a href="/wiki/Geyser" title="Geyser">Geyser</a></li> <li><a href="/wiki/Guyot" title="Guyot">Guyot</a></li> <li><a href="/wiki/Lava_dome" title="Lava dome">Lava dome</a></li> <li><a href="/wiki/Lava_field" title="Lava field">Lava field</a></li> <li><a href="/wiki/Submarine_volcano" title="Submarine volcano">Submarine volcano</a></li> <li><a href="/wiki/Volcanic_crater" title="Volcanic crater">Volcanic crater</a></li> <li><a href="/wiki/Volcanic_crater_lake" title="Volcanic crater lake">Volcanic crater lake</a></li> <li><a href="/wiki/Volcanic_dam" title="Volcanic dam">Volcanic dam</a></li> <li><a href="/wiki/Volcanic_island" title="Volcanic island">Volcanic island</a></li> <li><a href="/wiki/Volcanic_plateau" title="Volcanic plateau">Volcanic plateau</a></li> <li><a href="/wiki/Volcanic_plug" title="Volcanic plug">Volcanic plug</a></li> <li><a href="/wiki/Volcano" title="Volcano">Volcano</a></li> <li><a class="mw-selflink selflink">Wall rock</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Aeolian_processes" title="Aeolian processes">Aeolian</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Desert" title="Desert">Desert</a></li> <li><a href="/wiki/Dry_lake" title="Dry lake">Dry lake</a></li> <li><a href="/wiki/Dune" title="Dune">Dune</a></li> <li><a href="/wiki/Sandhill" title="Sandhill">Sandhill</a></li> <li><a href="/wiki/Tundra" title="Tundra">Tundra</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Artificial</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Artificial_island" title="Artificial island">Artificial island</a></li> <li><a href="/wiki/Artificial_reef" title="Artificial reef">Artificial reef</a></li> <li><a href="/wiki/Bridge" title="Bridge">Bridge</a></li> <li><a href="/wiki/Building" title="Building">Building</a></li> <li><a href="/wiki/Canal" title="Canal">Canal</a></li> <li><a href="/wiki/Dam" title="Dam">Dam</a></li> <li><a href="/wiki/Ditch" title="Ditch">Ditch</a></li> <li><a href="/wiki/Land_reclamation" title="Land reclamation">Land reclamation</a></li> <li><a href="/wiki/Levee" title="Levee">Levee</a></li> <li><a href="/wiki/Polder" title="Polder">Polder</a></li> <li><a href="/wiki/Quarry" title="Quarry">Quarry</a></li> <li><a href="/wiki/Reservoir" title="Reservoir">Reservoir</a></li> <li><a href="/wiki/Road" title="Road">Road</a></li> <li><a href="/wiki/Tunnel" title="Tunnel">Tunnel</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div> <ul><li><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/Geographical_feature" title="Geographical feature">Geographical feature</a></div></li></ul> </div></td></tr></tbody></table></div> <style data-mw-deduplicate="TemplateStyles:r1271159938">.mw-parser-output .asbox{position:relative;overflow:hidden}.mw-parser-output .asbox table{background:transparent}.mw-parser-output .asbox p{margin:0}.mw-parser-output .asbox 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