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Dinosaur National Monument is a United States National Monument located on the southeast flank of the Uinta Mountains on the border between Colorado and Utah at the confluence of the Green and Yampa Rivers. Although most of the monument area is in Moffat County, Colorado, the Dinosaur Quarry is located in Utah just to the north of the town of Jensen, Utah. The nearest communities are Jensen, Utah, and Dinosaur, Colorado. The park contains over 800 paleontological sites and has fossils of dinosaurs including Allosaurus, Deinonychus, Abydosaurus (a nearly complete skull, lower jaws and first four neck vertebrae of the specimen DINO 16488 found here at the base of the Mussentuchit Member of the Cedar Mountain Formation is the holotype for the description) and various long-neck, long-tail sauropods. It was declared a National Monument on October 4, 1915. The rock layer enclosing the fossils is a sandstone and conglomerate bed of alluvial or river bed origin known as the Morrison Formation from the Jurassic Period some 150 million years old. The dinosaurs and other ancient animals were carried by the river system which eventually entombed their remains in Utah. The pile of sediments were later buried and lithified into solid rock. The layers of rock were later uplifted and tilted to their present angle by the mountain building forces that formed the Uintas during the Laramide orogeny. The relentless forces of erosion exposed the layers at the surface to be found by paleontologists. The dinosaur fossil beds (bone beds) were discovered in 1909 by Earl Douglass, a paleontologist working and collecting for the Carnegie Museum of Natural History. He and his crews excavated thousands of fossils and shipped them back to the museum in Pittsburgh, Pennsylvania for study and display. President Woodrow Wilson proclaimed the dinosaur beds as Dinosaur National Monument in 1915. The monument boundaries were expanded in 1938 from the original 80-acre (320,000 m2) tract surrounding the dinosaur quarry in Utah, to its present extent of over 200,000 acres (800 km²) in Utah and Colorado, encompassing the spectacular river canyons of the Green and Yampa. Though lesser-known than the fossil beds, the petroglyphs in Dinosaur National Monument are another treasure the monument holds. Due to problems with vandals, many of the sites are not listed on area maps. The "Wall of Bones" located within the Dinosaur Quarry building in the park consists of a steeply tilted (67° from horizontal) rock layer which contains hundreds of dinosaur fossils. The enclosing rock has been chipped away to reveal the fossil bones intact for public viewing. In July 2006, the Quarry Visitor Center was closed due to structural problems that since 1957 had plagued the building because it was built on unstable clay. The decision was made to build a new facility elsewhere in the monument to house the visitor center and administrative functions, making it easier to resolve the structural problems of the quarry building while still retaining a portion of the historic Mission 66 era exhibit hall. It was announced in April 2009 that Dinosaur National Monument would receive $13.1 million to refurbish and reopen the gallery as part of the Obama administration's $750 billion stimulus plan. The Park Service successfully rebuilt the Quarry Exhibit Hall, supporting its weight on 70-foot steel micropile columns that extend to the bedrock below the unstable clay. The Dinosaur Quarry was reopened in Fall 2011. en.wikipedia.org/wiki/Dinosaur_National_Monument en.wikipedia.org/wiki/Wikipedia:Text_of_Creative_Commons_...

A Specimen of Parapuzosia daubreei (de Grossouvre, 1894), Santonian, Shumen on display at Sofia University "St. Kliment Ohridski' Museum of Paleontology and Historical Geology

Close up of the Eulithomyrmex rugosus holotype head. Museum of Comparative Zoology specimen UCM17019. Priabonian; Florissant Formation, Colorado, USA

Digital copy of 1978 slide. Natural History Museum, Smithsonian Institution, Washington, D.C. Complete indexed photo collection at WorldHistoryPics.com.

Digital copy of 1978 slide. Natural History Museum, Smithsonian Institution, Washington, D.C. Complete indexed photo collection at WorldHistoryPics.com.

Digital copy of 1978 slide. Natural History Museum, Smithsonian Institution, Washington, D.C. Complete indexed photo collection at WorldHistoryPics.com.

Granite of Devonian/Carboniferous age from the Stubai Alps. This rock is on display at the geological public collection of the Alpines Museum in Munich.

HKU zh:香港大學 Stephen Hui Geological Museum zh:許士芬地質博物館 Mesozoic 中生代 rocks Oct 2016

"Life in the Mesozoic" exhibit, Burke Museum, University of Washington, Seattle, Washington.

Took the picture at Natural History Museum, Nurnberg

Took the picture at Jura-Museum, Eichstaett

Eleniceras cf. curvicostatum (Tzankov), Lower Hauterivian, Kalotina, Bulgaria Cr1 963X1 at the Sofia University 'St. Kliment Ohriski' Museum of Paleontology and Historical Geology

Eleniceras aff. stevrecensis Breskovski, Lower Hauterivian, Dragoman, Bulgaria, Cr1 959 - Cr1 960 X 1 at the Sofia University 'St. Kliment Ohridski' Museum of Paleontology and Historical Geology

DUVALIA POLYGONALIS (BLAINVILLE) HAUTERIVIAN TEKE DERE SHUMEN SOFIA UNIVERSITY 'ST. KLIMENT OHRIDSKI' MUSEUM OF PALEONTOLOGY AND HISTORICAL GEOLOGY

Distoloceras belimelensis sp.n. Lower Hauterivian, Belimel, Montana Province, Cr1 970X1 (Coll. G. Mandov) at the Sofia University 'St. Kliment Ohridski' Museum of Paleontology and Historical Geology

Crioceratites fabreae fossils on display at the French National Museum of Natural History in Paris, France.