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id="mw-indicator-coordinates" class="mw-indicator"><div class="mw-parser-output"><span id="coordinates"><a href="/wiki/Geographic_coordinate_system" title="Geographic coordinate system">Coordinates</a>: <style data-mw-deduplicate="TemplateStyles:r1156832818">.mw-parser-output .geo-default,.mw-parser-output .geo-dms,.mw-parser-output .geo-dec{display:inline}.mw-parser-output .geo-nondefault,.mw-parser-output .geo-multi-punct,.mw-parser-output .geo-inline-hidden{display:none}.mw-parser-output .longitude,.mw-parser-output .latitude{white-space:nowrap}</style><span class="plainlinks nourlexpansion"><a class="external text" href="https://geohack.toolforge.org/geohack.php?pagename=Dinosaur_Ridge&params=39.6757_N_105.1934_W_type:landmark_region:US-CO"><span class="geo-nondefault"><span class="geo-dms" title="Maps, aerial photos, and other data for this location"><span class="latitude">39°40′33″N</span> <span class="longitude">105°11′36″W</span></span></span><span class="geo-multi-punct"> / </span><span class="geo-default"><span class="geo-dec" title="Maps, aerial photos, and other data for this location">39.6757°N 105.1934°W</span><span style="display:none"> / <span class="geo">39.6757; -105.1934</span></span></span></a></span></span></div></div> </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">Natural heritage site in Colorado, United States</div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">For other uses, see <a href="/wiki/Dinosaur_Ridge_(disambiguation)" class="mw-disambig" title="Dinosaur Ridge (disambiguation)">Dinosaur Ridge (disambiguation)</a>.</div> <p class="mw-empty-elt"> </p> <style data-mw-deduplicate="TemplateStyles:r1257001546">.mw-parser-output .infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><style data-mw-deduplicate="TemplateStyles:r1095843157">.mw-parser-output .ib-landform{width:23em;border-collapse:collapse;line-height:1.2em}.mw-parser-output .ib-landform td,.mw-parser-output .ib-landform th{border-top:1px solid #a2a9b1;padding:0.4em 0.6em 0.4em 0.6em}.mw-parser-output .ib-landform .mergedtoprow .infobox-full-data,.mw-parser-output .ib-landform .mergedtoprow .infobox-header,.mw-parser-output .ib-landform .mergedtoprow .infobox-data,.mw-parser-output .ib-landform .mergedtoprow .infobox-label,.mw-parser-output .ib-landform .mergedtoprow .infobox-below{border-top:1px solid #a2a9b1;padding:0.4em 0.6em 0.2em 0.6em}.mw-parser-output .ib-landform .mergedrow .infobox-full-data,.mw-parser-output .ib-landform .mergedrow .infobox-data,.mw-parser-output .ib-landform .mergedrow .infobox-label{border:0;padding:0 0.6em 0.2em 0.6em}.mw-parser-output .ib-landform .mergedbottomrow .infobox-full-data,.mw-parser-output .ib-landform .mergedbottomrow .infobox-data,.mw-parser-output .ib-landform .mergedbottomrow .infobox-label{border-top:0;border-bottom:1px solid #a2a9b1;padding:0 0.6em 0.4em 0.6em}.mw-parser-output .ib-landform .maptable{border:0;padding:0}.mw-parser-output .ib-landform .infobox-header,.mw-parser-output .ib-landform .infobox-below{text-align:left}.mw-parser-output .ib-landform .infobox-above{font-size:125%;line-height:1.3em}.mw-parser-output .ib-landform .infobox-subheader{background-color:#e7dcc3;font-weight:bold}.mw-parser-output .ib-landform-native{font-weight:normal;padding-top:0.2em}.mw-parser-output .ib-landform-other-name{font-size:78%}.mw-parser-output .ib-landform-official{font-weight:bold}.mw-parser-output .ib-landform-caption{padding:0.3em 0 0 0}.mw-parser-output .ib-landform-caption-link{padding:0.2em 0}.mw-parser-output .ib-landform-nickname{display:inline}.mw-parser-output .ib-landform-fn{font-weight:normal;display:inline}</style><table class="infobox ib-landform vcard"><tbody><tr><th colspan="2" class="infobox-above"><div class="fn org">Dinosaur Ridge</div></th></tr><tr><td colspan="2" class="infobox-subheader"><div class="category"><a href="/wiki/Ridge" title="Ridge">Ridge</a></div></td></tr><tr class="mergedtoprow"><td colspan="2" class="infobox-full-data"><span typeof="mw:File"><a href="/wiki/File:Dinosaur_Ridge_tracks.JPG" class="mw-file-description" title="Tracks on Dinosaur Ridge"><img alt="Tracks on Dinosaur Ridge" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/7f/Dinosaur_Ridge_tracks.JPG/250px-Dinosaur_Ridge_tracks.JPG" decoding="async" width="250" height="188" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/7f/Dinosaur_Ridge_tracks.JPG/375px-Dinosaur_Ridge_tracks.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/7f/Dinosaur_Ridge_tracks.JPG/500px-Dinosaur_Ridge_tracks.JPG 2x" data-file-width="2764" data-file-height="2074" /></a></span><div class="ib-landform-caption">Tracks on Dinosaur Ridge</div></td></tr><tr class="mergedtoprow"><td colspan="2" class="infobox-full-data"><style data-mw-deduplicate="TemplateStyles:r1238443738">.mw-parser-output .locmap .od{position:absolute}.mw-parser-output .locmap .id{position:absolute;line-height:0}.mw-parser-output .locmap .l0{font-size:0;position:absolute}.mw-parser-output .locmap .pv{line-height:110%;position:absolute;text-align:center}.mw-parser-output .locmap .pl{line-height:110%;position:absolute;top:-0.75em;text-align:right}.mw-parser-output .locmap .pr{line-height:110%;position:absolute;top:-0.75em;text-align:left}.mw-parser-output .locmap .pv>div{display:inline;padding:1px}.mw-parser-output .locmap .pl>div{display:inline;padding:1px;float:right}.mw-parser-output .locmap .pr>div{display:inline;padding:1px;float:left}@media screen{html.skin-theme-clientpref-night .mw-parser-output .od,html.skin-theme-clientpref-night .mw-parser-output .od .pv>div,html.skin-theme-clientpref-night .mw-parser-output .od .pl>div,html.skin-theme-clientpref-night .mw-parser-output .od .pr>div{background:#fff!important;color:#000!important}html.skin-theme-clientpref-night .mw-parser-output .locmap{filter:grayscale(0.6)}html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data .locmap div{background:transparent!important}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .locmap{filter:grayscale(0.6)}html.skin-theme-clientpref-os .mw-parser-output .od,html.skin-theme-clientpref-os .mw-parser-output .od .pv>div,html.skin-theme-clientpref-os .mw-parser-output .od .pl>div,html.skin-theme-clientpref-os .mw-parser-output .od .pr>div{background:white!important;color:#000!important}html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data .locmap div{background:transparent!important}}</style><div class="center"><div class="locmap" style="width:250px;float:none;clear:both;margin-left:auto;margin-right:auto"><div style="width:250px;padding:0"><div style="position:relative;width:250px"><span class="notpageimage" typeof="mw:File"><a href="/wiki/File:USA_Colorado_location_map.svg" class="mw-file-description" title="Dinosaur Ridge is located in Colorado"><img alt="Dinosaur Ridge is located in Colorado" src="//upload.wikimedia.org/wikipedia/commons/thumb/1/19/USA_Colorado_location_map.svg/250px-USA_Colorado_location_map.svg.png" decoding="async" width="250" height="183" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/19/USA_Colorado_location_map.svg/375px-USA_Colorado_location_map.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/19/USA_Colorado_location_map.svg/500px-USA_Colorado_location_map.svg.png 2x" data-file-width="1067" data-file-height="783" /></a></span><div class="od notheme" style="top:34.643%;left:54.755%;font-size:91%"><div class="id" style="left:-3px;top:-3px"><span class="notpageimage" typeof="mw:File"><span title="Dinosaur Ridge"><img alt="Dinosaur Ridge" src="//upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Red_pog.svg/6px-Red_pog.svg.png" decoding="async" width="6" height="6" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Red_pog.svg/9px-Red_pog.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Red_pog.svg/12px-Red_pog.svg.png 2x" data-file-width="64" data-file-height="64" /></span></span></div><div class="pr" style="width:6em;left:4px"><div>Dinosaur Ridge</div></div></div></div><div style="padding-top:0.2em"></div></div></div></div></td></tr><tr><td colspan="2" class="infobox-full-data">Coordinates: <span class="geo-inline"><style data-mw-deduplicate="TemplateStyles:r1156832818">.mw-parser-output .geo-default,.mw-parser-output .geo-dms,.mw-parser-output .geo-dec{display:inline}.mw-parser-output .geo-nondefault,.mw-parser-output .geo-multi-punct,.mw-parser-output .geo-inline-hidden{display:none}.mw-parser-output .longitude,.mw-parser-output .latitude{white-space:nowrap}</style><span class="plainlinks nourlexpansion"><a class="external text" href="https://geohack.toolforge.org/geohack.php?pagename=Dinosaur_Ridge&params=39.6757_N_105.1934_W_type:landmark_region:US-CO"><span class="geo-nondefault"><span class="geo-dms" title="Maps, aerial photos, and other data for this location"><span class="latitude">39°40′33″N</span> <span class="longitude">105°11′36″W</span></span></span><span class="geo-multi-punct"> / </span><span class="geo-default"><span class="geo-dec" title="Maps, aerial photos, and other data for this location">39.6757°N 105.1934°W</span><span style="display:none"> / <span class="geo">39.6757; -105.1934</span></span></span></a></span></span></td></tr><tr class="mergedtoprow"><th scope="row" class="infobox-label">Location</th><td class="infobox-data">Dinosaur Ridge, part of the Golden-Morrison Fossil Areas National Natural Landmark, Jefferson County, Colorado, United States</td></tr><tr class="mergedrow"><th scope="row" class="infobox-label">Part of</th><td class="infobox-data">Dakota Hogback</td></tr><tr class="mergedtoprow"><th scope="row" class="infobox-label"><a href="/wiki/Geologic_time_scale" title="Geologic time scale">Age</a></th><td class="infobox-data">Cretaceous and Jurassic</td></tr></tbody></table> <p><b>Dinosaur Ridge</b> is a segment of the <a href="/wiki/Dakota_Hogback" title="Dakota Hogback">Dakota Hogback</a> in the Morrison Fossil Area <a href="/wiki/National_Natural_Landmark" title="National Natural Landmark">National Natural Landmark</a> located in <a href="/wiki/Jefferson_County,_Colorado" title="Jefferson County, Colorado">Jefferson County, Colorado</a>, near the town of <a href="/wiki/Morrison,_Colorado" title="Morrison, Colorado">Morrison</a> and just west of <a href="/wiki/Denver" title="Denver">Denver</a>. </p><p>In 1876, fossil excavation began at Dinosaur Ridge under the direction of Yale paleontologist Dr. <a href="/wiki/Othniel_Charles_Marsh" title="Othniel Charles Marsh">Othniel Charles Marsh</a>.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> The first identified <a href="/wiki/Stegosaurus" title="Stegosaurus">Stegosaurus</a> fossils in the world were discovered here, and fossil bones found in the layers of rock here represent some well-known dinosaurs, including <i><a href="/wiki/Apatosaurus" title="Apatosaurus">Apatosaurus</a></i>, <i><a href="/wiki/Camarasaurus" title="Camarasaurus">Camarasaurus</a>,</i> <i><a href="/wiki/Diplodocus" title="Diplodocus">Diplodocus</a></i>, and <i><a href="/wiki/Allosaurus" title="Allosaurus">Allosaurus</a></i>. In 1973, the area was recognized as an outstanding example of the nation's natural heritage, and was designated a National Natural Landmark by the <a href="/wiki/National_Park_Service" title="National Park Service">National Park Service</a>. The area was expanded in June 2011, and combined with another tracksite in Golden at the Parfet Prehistoric Preserve. These two sites, along with a few other nearby fossil sites in Golden, were combined, and the National Natural Landmark is now known as the <b>Morrison-Golden Fossil Areas</b>. In 1989, the Friends of Dinosaur Ridge non-profit was formed to address concerns regarding the preservation of the site and to offer educational programs on the area's resources. </p><p>The rocks on the west side of Dinosaur Ridge are part of the widespread <a href="/wiki/Morrison_Formation" title="Morrison Formation">Morrison Formation</a> of <a href="/wiki/Jurassic" title="Jurassic">Jurassic</a> age. It is in these rocks where <a href="/wiki/Arthur_Lakes" title="Arthur Lakes">Arthur Lakes</a> discovered dinosaur bones in 1876. Subsequently, several quarries were excavated along the Dakota <a href="/wiki/Hogback_(geology)" title="Hogback (geology)">hogback</a> in the Morrison area in search of more fossils. Evidence of a variety of dinosaur genera and species was found here, as well as fossils identified to be from prehistoric turtles and lungfish. Research is ongoing. </p><p>The rocks on the east side of Dinosaur Ridge are part of the <a href="/wiki/Cretaceous" title="Cretaceous">Cretaceous</a> <a href="/wiki/Dakota_Formation" title="Dakota Formation">Dakota Formation</a>. When Alameda Parkway was being constructed in 1937 (by the <a href="/wiki/Works_Progress_Administration" title="Works Progress Administration">WPA</a>) in order to provide access to <a href="/wiki/Red_Rocks_Park" title="Red Rocks Park">Red Rocks Park</a> and Amphitheatre, workers discovered dinosaur tracks.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> As those footprints were damaged and destroyed over time, more tracks were intentionally uncovered in later decades. These were found to include mostly <i><a href="/wiki/Iguanodon" title="Iguanodon">Iguanodon</a></i>-like footprints, perhaps from an ornithopod dinosaur called <i><a href="/wiki/Eolambia" title="Eolambia">Eolambia</a></i>. Omnivorous bird-like ornithomimid tracks, crocodilian tracks, and large carnivorous <a href="/wiki/Theropod" class="mw-redirect" title="Theropod">theropod</a> tracks are also present. </p><p>The site offers guided bus tours, interpretive signage, a small Exhibit Hall with geological and paleontological displays, a Discovery Center, and a gift shop. Dinosaur Ridge's interpretive signs at trail locations explain the local geology, paleo-ecology, trace fossils, bone fossils, economic development of coal, oil, and clay, and many other geologic and paleontological features.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Dinosaur_ridge_roadcut_I-70.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d9/Dinosaur_ridge_roadcut_I-70.jpg/220px-Dinosaur_ridge_roadcut_I-70.jpg" decoding="async" width="220" height="116" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d9/Dinosaur_ridge_roadcut_I-70.jpg/330px-Dinosaur_ridge_roadcut_I-70.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d9/Dinosaur_ridge_roadcut_I-70.jpg/440px-Dinosaur_ridge_roadcut_I-70.jpg 2x" data-file-width="1181" data-file-height="625" /></a><figcaption>Roadcut where <a href="/wiki/Interstate_70_in_Colorado" title="Interstate 70 in Colorado">I-70</a> cuts through Dinosaur Ridge</figcaption></figure> <div class="mw-heading mw-heading2"><h2 id="Dinosaur_Ridge_Trail">Dinosaur Ridge Trail</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Dinosaur_Ridge&action=edit&section=1" title="Edit section: Dinosaur Ridge Trail"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Dinosaur_Ridge_2017-09-30_1762.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/fc/Dinosaur_Ridge_2017-09-30_1762.jpg/220px-Dinosaur_Ridge_2017-09-30_1762.jpg" decoding="async" width="220" height="124" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/fc/Dinosaur_Ridge_2017-09-30_1762.jpg/330px-Dinosaur_Ridge_2017-09-30_1762.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/fc/Dinosaur_Ridge_2017-09-30_1762.jpg/440px-Dinosaur_Ridge_2017-09-30_1762.jpg 2x" data-file-width="4608" data-file-height="2592" /></a><figcaption>Pedestrian & bike only access to Dinosaur Ridge, Colorado. Visitors may also choose to take a guided bus tour.</figcaption></figure> <p>The outdoor exhibits are located along a closed section of West Alameda Ave. This trail follows a paved closed road that climbs about 700 feet (210 m) from the main visitor center to the high point along the ridge backbone. The walk is about 2 miles (3.2 km) round-trip, taking approximately 1 1/2 to 2 hours. The Exhibit Hall is near the main visitor center and a fully guided bus tour is available. </p> <ul><li><b>Exhibit Hall and Main Visitor Center</b> (elevation 5,975 feet (1,821 m))</li> <li><b>Golden Fault</b></li> <li><b>Benton Shale</b></li> <li><b><a href="/wiki/Western_Interior_Seaway" title="Western Interior Seaway">Western Interior Seaway</a> -</b> During the <a href="/wiki/Cretaceous" title="Cretaceous">Cretaceous</a> Period this was the bottom sediment of the <a href="/wiki/Western_Interior_Seaway" title="Western Interior Seaway">Western Interior Seaway</a>.</li> <li><b>Dakota Sandstone</b> - During the <a href="/wiki/Cretaceous" title="Cretaceous">Cretaceous</a> Period this was the shore of the <a href="/wiki/Western_Interior_Seaway" title="Western Interior Seaway">Western Interior Seaway</a>. The build-up of soils from the coastal plains created the Dakota Group.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup></li> <li><b>Dinosaur Courtship</b></li> <li><b>Ripple Marks</b> – <a href="/wiki/Ripple_marks" title="Ripple marks">Ripple marks</a> form on the sandy bottoms of water feature because of wave motion or currents. The direction of the water is perpendicular or across the ridges.<sup id="cite_ref-auto_7-0" class="reference"><a href="#cite_note-auto-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup></li> <li><b>Slimy Beach</b> – A mat of <a href="/wiki/Microorganisms" class="mw-redirect" title="Microorganisms">microorganisms</a> formed on a <a href="/wiki/Tidal_flat" class="mw-redirect" title="Tidal flat">tidal flat</a> that was flooded during extremely high tides. At some point, the area was rapidly buried starting a process of fossilization. The gray surfaces were fully developed mats. Depressed areas have been degraded by an outside force, such as a dinosaur's footprint. Additional degradation from water currents are shown by the ripple marks.<sup id="cite_ref-auto_7-1" class="reference"><a href="#cite_note-auto-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup></li> <li><b>Dinosaur Tracks</b> - From the footprints found here, it is possible to glean information about the lives and behaviors of the animals that lived here. These <a href="/wiki/Ornithopods" class="mw-redirect" title="Ornithopods">Ornithopods</a>, i.e., <a href="/wiki/Iguanodon" title="Iguanodon">Iguanodon</a>, or Eolambia, were quadrupedal, with bipedal tracks from smaller individuals (juveniles). The tracks show that these dinosaurs lacked claws on their feet, and their rounded toes indicate a diet of plants. The presence of 18 inches (46 cm) tracks adjacent to 10 inches (25 cm) prints is taken as evidence of parenting behavior.<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup></li> <li><b>Trace Fossils</b> The exposure of <a href="/wiki/Dakota_Sandstone" class="mw-redirect" title="Dakota Sandstone">Dakota Sandstone</a> reveals numerous 'trace fossils'. These are fossils that appear as irregularities of the rock. They are actually the remnants of animal burrows and marine plants.<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup></li></ul> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Ecology_2017-09-30_1728.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/58/Ecology_2017-09-30_1728.jpg/220px-Ecology_2017-09-30_1728.jpg" decoding="async" width="220" height="147" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/58/Ecology_2017-09-30_1728.jpg/330px-Ecology_2017-09-30_1728.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/58/Ecology_2017-09-30_1728.jpg/440px-Ecology_2017-09-30_1728.jpg 2x" data-file-width="4608" data-file-height="3072" /></a><figcaption>Cinquefoil (Potentilla diversifolia) along Dinosaur Ridge, Golden-Morrison Fossil Areas National Natural Landmark, Colorado.</figcaption></figure> <ul><li><b>Ecology</b> The hogback is a transitional zone between the <a href="/wiki/Rocky_Mountains" title="Rocky Mountains">Rocky Mountains</a> and the <a href="/wiki/High_Plains_(United_States)" title="High Plains (United States)">High Plains</a>. Plants and animals from both areas can be found. Among the plants are <a href="/wiki/Mountain_mahogany" class="mw-redirect" title="Mountain mahogany">Mountain mahogany</a>, <a href="/wiki/Junipers" class="mw-redirect" title="Junipers">junipers</a>, <a href="/wiki/Sumacs" class="mw-redirect" title="Sumacs">sumacs</a>, <a href="/wiki/Quercus_gambelii" title="Quercus gambelii">Gambel's oak</a> and a few <a href="/wiki/Ponderosa_pines" class="mw-redirect" title="Ponderosa pines">Ponderosa pines</a>. The dominant mammals are the <a href="/wiki/Mule_deer" title="Mule deer">mule deer</a>, <a href="/wiki/Rock_squirrel" title="Rock squirrel">rock squirrel</a>, and <a href="/wiki/Foxes" class="mw-redirect" title="Foxes">foxes</a>. <a href="/wiki/Woodhouse%27s_scrub_jay" title="Woodhouse's scrub jay">Scrub jays</a> and <a href="/wiki/Magpies" class="mw-redirect" title="Magpies">magpies</a> are the representative birds. During spring migration, over 2,000 <a href="/wiki/Bird_of_prey" title="Bird of prey">raptors</a> pass northwards along the ridge.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup></li> <li><b>Hogback</b> (elevation 6,175 feet (1,882 m)) – The ridge is part of the Dakota Hogback, paralleling the front range of the Rocky Mountains. The term hogback is a reference to a similarity to the back of an <a href="/wiki/Feral_pig" title="Feral pig">Arkansas razorback hog</a>. A harder layer of resistant rock forms the ‘backbone’ or ‘hogback’. Here, it is <a href="/wiki/Dakota_Formation" title="Dakota Formation">Dakota sandstone</a>. Softer layers above erode, leaving the backbone rising above the surrounding landscape. Softer layers below the Dakota sandstone form an escarpment in the older layers below.<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup></li> <li><b>Denver Basin/Oil and Gas</b><sup id="cite_ref-auto_7-2" class="reference"><a href="#cite_note-auto-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup><figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Cretaceous_Time_2017-09-30_1691.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/df/Cretaceous_Time_2017-09-30_1691.jpg/220px-Cretaceous_Time_2017-09-30_1691.jpg" decoding="async" width="220" height="147" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/df/Cretaceous_Time_2017-09-30_1691.jpg/330px-Cretaceous_Time_2017-09-30_1691.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/df/Cretaceous_Time_2017-09-30_1691.jpg/440px-Cretaceous_Time_2017-09-30_1691.jpg 2x" data-file-width="4608" data-file-height="3072" /></a><figcaption>Cretaceous period sandstone layers in the road cut at Dinosaur Ridge, Golden-Morrison Fossil Areas National Natural Landmark, Colorado.</figcaption></figure></li> <li><b>Concretion</b> - A large, ball-shaped <a href="/wiki/Concretion" title="Concretion">concretion</a> were found in this layer of rock. Concretions form around a central nucleus (sometimes organic material). The formation of concretions is still a bit of a mystery.<sup id="cite_ref-auto_7-3" class="reference"><a href="#cite_note-auto-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup></li> <li><b>Volcanic Ash Bed</b> – Bedded among layers of sandstone is a white layer of <a href="/wiki/Volcanic_ash" title="Volcanic ash">volcanic ash</a>. In 2009, the <a href="/wiki/Massachusetts_Institute_of_Technology" title="Massachusetts Institute of Technology">Massachusetts Institute of Technology</a> dated it to 104.6 Mya matching the <a href="/wiki/Cretaceous" title="Cretaceous">Cretaceous</a> Period of the fossil record. The ash came from volcanic fields far to the west.<sup id="cite_ref-auto_7-4" class="reference"><a href="#cite_note-auto-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup></li> <li><b>Geologic Overview</b> - including a look west to the 300 mya Fountain Formation, in which Red Rocks Amphitheatre is located.</li> <li><b>Dinosaur Bulges</b> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Bronto_Bulges_2017-09-30_1637.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/5e/Bronto_Bulges_2017-09-30_1637.jpg/220px-Bronto_Bulges_2017-09-30_1637.jpg" decoding="async" width="220" height="147" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/5e/Bronto_Bulges_2017-09-30_1637.jpg/330px-Bronto_Bulges_2017-09-30_1637.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/5e/Bronto_Bulges_2017-09-30_1637.jpg/440px-Bronto_Bulges_2017-09-30_1637.jpg 2x" data-file-width="4608" data-file-height="3072" /></a><figcaption>Guide describing the "bulges" - a track exhibit at Dinosaur Ridge, in the Golden-Morrison Fossil Areas National Natural Landmark, Colorado.</figcaption></figure> The bulges are natural casts - the "undersides" of footprints. Walking across soft mud and sand, animals made footprints in the soil, and then more mud and sand filled in the footprints, forming a new layer of sediment. Over time these layers of sediment lithified into rock, and then uplift and erosion revealed the fossilized footprints. Footprint bulges at this site represent those of a large <a href="/wiki/Sauropod" class="mw-redirect" title="Sauropod">sauropod</a>, as well as a smaller bipedal herbivore (possibly a <a href="/wiki/Camptosaurus" title="Camptosaurus">Camptosaurus</a>).</li> <li><b>Theropod Track</b> - Removed from its original location in 1937 during road construction, the track is from a carnivorous theropod, possibly a young Allosaurus, which is a dinosaur whose fossils have been found in these layers. The animal that left this particular track is estimated to have been about 11.5 feet (3.5 m) tall.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup></li> <li><b>Dinosaur Bone Quarry</b> – Scattered throughout this layer are rusty brown fossils. The fossils are smooth in texture and rusty brown in color. They include fossilized dinosaur ribs, vertebrae, and leg bones, as well as teeth, and a variety of other identifications, including turtle and lungfish fossils. Among the fossils identified here were the first-named <a href="/wiki/Stegosaurus" title="Stegosaurus">Stegosaurus</a> fossils, two types of <a href="/wiki/Sauropod" class="mw-redirect" title="Sauropod">sauropod</a> fossils (Apatosaurus and Camarasaurus), as well as Allosaurus fossils. <sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> Bone deposits formed along the inside of a bend of a fast-moving stream, forming a "point bar" as the fast-moving water deposited sand and the bones of decaying animals. Over time, a series of point bars developed with a variety of bones encased in the sand to become fossils.<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup></li> <li><b>West Gate</b> (elevation 6,100 feet (1,900 m)) The west end of the trail is barricaded across the roadway, but vehicles are allowed to park along the spur from Morrison Road that has become a cul-de-sac.</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=Dinosaur_Ridge&action=edit&section=2" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text">McCarren, Mark J. <i>The Scientific Contributions of Othniel Charles Marsh</i>, pp. 7–8, Peabody Museum of Natural History, Yale University, New Haven, Connecticut, 1993. <style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/0-912532-32-7" title="Special:BookSources/0-912532-32-7">0-912532-32-7</a>.</span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFZialcita_·2024" class="citation web cs1">Zialcita ·, Paolo (July 9, 2024). <a rel="nofollow" class="external text" href="https://www.cpr.org/2024/07/09/solution-to-save-dinosaur-ridge-fossilized-tracks-disappearing/">"Dinosaur Ridge's fossilized tracks are disappearing. Finding a solution has stakeholders between a rock and a hard place"</a>. <i>Colorado Public Radio</i><span class="reference-accessdate">. Retrieved <span class="nowrap">July 15,</span> 2024</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Colorado+Public+Radio&rft.atitle=Dinosaur+Ridge%E2%80%99s+fossilized+tracks+are+disappearing.+Finding+a+solution+has+stakeholders+between+a+rock+and+a+hard+place&rft.date=2024-07-09&rft.aulast=Zialcita+%C2%B7&rft.aufirst=Paolo&rft_id=https%3A%2F%2Fwww.cpr.org%2F2024%2F07%2F09%2Fsolution-to-save-dinosaur-ridge-fossilized-tracks-disappearing%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADinosaur+Ridge" class="Z3988"></span></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text">Hunt, Adrian, Lockley, Martin and White, Sally <i>Historic Dinosaur Quarries of the Dinosaur Ridge Area</i> Friends of Dinosaur Ridge and the University of Colorado at Denver Trackers Research Group, 2002.</span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text">Lockley, Martin and Marquardt, Lori <i>A Field Guide to Dinosaur Ridge</i> Friends of Dinosaur Ridge and the University of Colorado at Denver Trackers Research Group, 1995.</span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.dinoridge.org">"Dinosaur Ridge - Home - Morrison, Colorado"</a>. <i>www.dinoridge.org</i><span class="reference-accessdate">. Retrieved <span class="nowrap">April 11,</span> 2018</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=www.dinoridge.org&rft.atitle=Dinosaur+Ridge+-+Home+-+Morrison%2C+Colorado&rft_id=http%3A%2F%2Fwww.dinoridge.org&rfr_id=info%3Asid%2Fen.wikipedia.org%3ADinosaur+Ridge" class="Z3988"></span></span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text">Cretaceous Time: Rocky Mountain Association of Geologists Foundation; Dinosaur Ridge; Colorado Natural Area Program; Morrison Colorado; undated</span> </li> <li id="cite_note-auto-7"><span class="mw-cite-backlink">^ <a href="#cite_ref-auto_7-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-auto_7-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-auto_7-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-auto_7-3"><sup><i><b>d</b></i></sup></a> <a href="#cite_ref-auto_7-4"><sup><i><b>e</b></i></sup></a></span> <span class="reference-text">Ripple Marks; Greater Denver Area Gem and Mineral Council; Dinosaur Ridge; Colorado Natural Area Program; Morrison Colorado; undated</span> </li> <li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text">Dinosaur Tracks; Greater Denver Area Gem and Mineral Council; Dinosaur Ridge; Colorado Natural Area Program; Morrison Colorado; undated</span> </li> <li id="cite_note-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-9">^</a></b></span> <span class="reference-text">Trace Fossils; Greater Denver Area Gem and Mineral Council; Dinosaur Ridge; Colorado Natural Area Program; Morrison Colorado; undated</span> </li> <li id="cite_note-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-10">^</a></b></span> <span class="reference-text">Ecology; Greater Denver Area Gem and Mineral Council; Dinosaur Ridge; Colorado Natural Area Program; Morrison Colorado; undated</span> </li> <li id="cite_note-11"><span class="mw-cite-backlink"><b><a href="#cite_ref-11">^</a></b></span> <span class="reference-text">Hogbacks; Hydrocarbon Exploration & Development, Rocky Mountain Association of Geologists Foundation, Goolsby Brothers and associates, inc; Dinosaur Ridge; Colorado Natural Area Program; Morrison Colorado; undated</span> </li> <li id="cite_note-12"><span class="mw-cite-backlink"><b><a href="#cite_ref-12">^</a></b></span> <span class="reference-text">Theropod Tracks; Rocky Mountain Association of Geologists Foundation; Dinosaur Ridge; Colorado Natural Area Program; Morrison Colorado; undated</span> </li> <li id="cite_note-13"><span class="mw-cite-backlink"><b><a href="#cite_ref-13">^</a></b></span> <span class="reference-text">Jurassic Fossils; Rocky Mountain Association of Geologists Foundation; Dinosaur Ridge; Colorado Natural Area Program; Morrison Colorado; undated</span> </li> <li id="cite_note-14"><span class="mw-cite-backlink"><b><a href="#cite_ref-14">^</a></b></span> <span class="reference-text">The Discovery; Rocky Mountain Association of Geologists Foundation; Dinosaur Ridge; Colorado Natural Area Program; Morrison Colorado; undated</span> </li> <li id="cite_note-15"><span class="mw-cite-backlink"><b><a href="#cite_ref-15">^</a></b></span> <span class="reference-text">Bone Deposition; Rocky Mountain Association of Geologists Foundation & Greater Denver Area Gem and Mineral Council; Dinosaur Ridge; Colorado Natural Area Program; Morrison Colorado; undated</span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Dinosaur_Ridge&action=edit&section=3" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style 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