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The Hell Creek Formation is an intensively studied division of mostly Upper Cretaceous and some lower Paleocene rocks in North America, named for exposures studied along Hell Creek, near Jordan, Montana. The formation stretches over portions of Montana, North Dakota, South Dakota, and Wyoming. In Montana, the Hell Creek Formation overlies the Fox Hills Formation. The site of Pompeys Pillar National Monument is a small isolated section of the Hell Creek Formation. In 1966, the Hell Creek Fossil Area was designated as a National Natural Landmark by the National Park Service.
The Lance (Creek) Formation is a division of Late Cretaceous rocks in the western United States. Named after Lance Creek, Wyoming, the microvertebrate fossils and dinosaurs represent important components of the latest Mesozoic vertebrate faunas. The Lance Formation is Late Maastrichtian in age, and shares much fauna with the Hell Creek Formation of Montana and North Dakota, the Frenchman Formation of southwest Saskatchewan, and the lower part of the Scollard Formation of Alberta.
The Laramie Formation is a geologic formation of the Late Cretaceous (Maastrichtian) age, named by Clarence King in 1876 for exposures in northeastern Colorado, in the United States. It was deposited on a coastal plain and in coastal swamps that flanked the Western Interior Seaway. It contains coal, clay and uranium deposits, as well as plant and animal fossils, including dinosaur remains.
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References
- ↑ Estes, Richard (1965). "A New Fossil Salamander from Montana and Wyoming" . Copeia. 1965 (1): 90–95. doi:10.2307/1441245. ISSN 0045-8511. JSTOR 1441245.
- ↑ Wilson, Gregory P.; DeMar, David G.; Carter, Grace (2014), "Extinction and survival of salamander and salamander-like amphibians across the Cretaceous-Paleogene boundary in northeastern Montana, USA" , Through the End of the Cretaceous in the Type Locality of the Hell Creek Formation in Montana and Adjacent Areas, Geological Society of America, doi:10.1130/2014.2503(10), ISBN 978-0-8137-2503-1 , retrieved 2022-12-21
- ↑ Carpenter, Kenneth (1979). "Vertebrate fauna of the Laramie Formation (Maestrichtian), Weld County, Colorado". Contributions to Geology. 17 (1): 37–49 – via Research Gate.
- ↑ Estes, Richard (1965-03-18). "A New Fossil Salamander from Montana and Wyoming". Copeia. 1965 (1): 90–95. doi:10.2307/1441245. JSTOR 1441245.
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