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The Morrison Formation is a distinctive sequence of Upper Jurassic sedimentary rock found in the western United States which has been the most fertile source of dinosaur fossils in North America. It is composed of mudstone , sandstone , siltstone , and limestone and is light gray, greenish gray, or red.
The Morrison Formation is a distinctive sequence of Upper Jurassic sedimentary rock that is found in the western United States, which has been the most fertile source of dinosaur fossils in North America. It is composed of mudstone, sandstone, siltstone and limestone and is light grey, greenish gray, or red.
The rocks on the west side of Dinosaur Ridge are part of the widespread Morrison Formation of Jurassic age. It is in these rocks where Arthur Lakes discovered dinosaur bones in 1876. Subsequently, several quarries were excavated along the Dakota hogback in the Morrison area in search of more fossils. Evidence of a variety of dinosaur genera and ...
The distinctive banding of the Morrison Formation, a group of rock layers that occur throughout Dinosaur National Monument and the source of fossils like those found at the Dinosaur Quarry. The Morrison Formation is a distinctive sequence of Late Jurassic sedimentary rock that is found in the western United States, which has a wide assortment ...
Carnegie Quarry is located in the Brushy Basin Member of the Morrison Formation. The site has been dated to between 150.91 and 150.04 million years ago. [5] The quarry is located in a sandstone bed known as the Quarry Sandstone. The Quarry Sandstone is unusual for the upper Morrison Formation in being relatively coarse-grained. [6]
Millions of prehistoric marine fossils were discovered beneath a California high school over the course of a multi-year construction project. The relics recovered at San Pedro High School included ...
The formation is composed primarily of claystones, mudstones, and siltstones, within which a variety of fossil organisms, collectively referred to as the White River fauna, can be found. The fossil assemblage of the formation includes tortoises, alligators, predatory birds, Perissodactyls such as primitive horses and rhinoceroses, Entelodonts ...
These fossils were the oldest known vertebrate remains in the world at the time. The rocks preserving the fossils were gray and reddish sandstone deposited by shallow water. Other fossils found alongside the ostracoderms lived articulated brachiopods, conodonts, gastropods, ostracods, pelecypods, sponges, trilobites, and trace fossils left by ...