The Quarry Visitor Center was opened officially to the public in 1958. Probably none was more famous than the original "Brontosaurus" excavated by Douglass, that remains the most complete ever found, and that has stood in Pittsburgh's Carnegie Museum since 1915. No less than a dozen well-articulated sauropods were excavated over a 15-year period ending in 1924. It is part of the overall 470-foot-thick Brushy Basin Member of the Morrison Formation that is dominantly mudstone. 2 Volcanoes certainly supplied the tuff grains, and perhaps the chert pebbles as well. The Quarry sandstone is composed chiefly of chert and tuff grains. 1 The sedimentary rock package containing the bones can be called the "Quarry sandstone," a lens-shaped pebbly sandstone up to 50 feet in thickness that is exposed for 3,000 feet along the ridge outcrop. As digging began, he was shocked at how the skeletons turned up, literally one on top of another, and how the smaller stegosaurs "got in the way" of the prized sauropods. On the heels of the American "dinosaur rush," Earl Douglass in 1909 discovered eight articulated brontosaur tail vertebrae, standing out in relief from a sandstone ridge in eastern Utah. How did such a burial take place? We seek to find the real significance of the deposit at Dinosaur National Monument (DNM) and to dispel myths that our culture has delivered to us. Extending from New Mexico to Canada, the Morrison Formation covers about 700 thousand square miles and has been assigned to the Jurassic System. This tangled knot of dinosaur bones represents a classic "mass burial" deposit, a trademark of what geologists call the Morrison Formation. The quarry face (known best as "The Wall") is surely the finest on-location dinosaur display in the world. The first-time visitor is stunned by the magnitude of the exhibit. More than one thousand large fossil bones stand out in bold relief upon the rock wall at the Quarry Visitor Center in Utah's Dinosaur National Monument.
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