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Oklahoma was a terrestrial environment for most of the ensuing Mesozoic era. [3] The Late Triassic Dockum Group of western Oklahoma preserved remains of archosaurs and temnospondyls, although its fossil record is restricted to a narrow region of the panhandle and is far sparser than the equivalent records in Texas, New Mexico, and Arizona. [98]
Fossils may be found either associated with a geological formation or at a single geographic site. Geological formations consist of rock that was deposited during a specific period of time. They usually extend for large areas, and sometimes there are different important sites in which the same formation is exposed.
Life restoration of the Early Cretaceous theropod dinosaur Acrocanthosaurus †Acrocanthosaurus – type locality for genus †Acrocanthosaurus atokensis – type locality for species †Albanerpeton †Albanerpeton arthridion †Allosaurus – type locality for genus †Allosaurus fragilis – type locality for species; Ammobaculites
Paleontologists have discovered a new mammal that lived with the dinosaurs in Colorado millions of years ago after unearthing a fossil in the northwest corner of the state. ... Their discovery ...
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 ...
Fossils from a newly discovered species of mammal in Colorado may offer clues into how life rebounded after Earth’s last mass extinction that killed off the dinosaurs, researchers say.
The Purgatoire River track site, also called the Picketwire Canyonlands tracksite, is one of the largest dinosaur tracksites in North America. [1] The site is located on public land of the Comanche National Grassland , along the Purgatoire ("Picketwire") River south of La Junta in Otero County, Colorado .
The earliest-known dinosaur fossils date to roughly 230 million years ago, including Eoraptor and Herrerasaurus from Argentina, Saturnalia from southern Brazil and Mbiresaurus from Zimbabwe.