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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 ...
Both the thick section of shale and the marine life fossils found (ammonites and skeletons of fish and such marine reptiles as mosasaurs, plesiosaurs, and extinct species of sea turtles, along with rare dinosaur and bird remains). Colorado eventually drained from being at the bottom of an ocean to land again, giving yield to another ...
This list of prehistoric sites in the U.S. State of Colorado includes historical and archaeological sites of humans from their earliest times in Colorado to just before the Colorado historic period, which ranges from about 12,000 BC to AD 19th century. The Period is defined by the culture enjoyed at the time, from the earliest hunter-gatherers ...
This list of the Paleozoic life of Colorado contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Colorado and are between 538.8 and 252.17 million years of age.
Fossilized skeleton of the Late Jurassic armored dinosaur Mymoorapelta †Mymoorapelta – type locality for genus †Mymoorapelta maysi – type locality for species; Myrica †Nanosaurus – type locality for genus †Nanosaurus agilis – type locality for species †Nanosaurus rex; Natica †Neocardioceras
The Maroon Formation is a geologic formation in Colorado. It preserves fossils dating back to the Permian period . It is the primary formation of sandstone that lends the vivid red color to the hills around Glenwood Springs, Colorado .
It is a designated area under the Colorado Natural Areas Program because there are 25 different types of trace fossils from crabs to fish and trilobites from the Ordovician Period. [7] There are 93 designated sites that in total protect more than 250 endangered, rare, or threatened species. [8]
Rabbit Valley is a valley located in northwestern Mesa County, Colorado, United States. [2] The site was discovered by a local Colorado couple in 1981 [3] Rabbit Valley contains numerous prehistoric remains from the Late Jurassic Period.