The Hell Creek Formation is an intensively-studied division of Upper Cretaceous to lower Paleocene rocks in North America, named for exposures studied along Hell Creek, near Jordan, Montana. The formation spans about 1.3 million years, terminating at the Cretaceous–Paleogene boundary, dated to 65.5 million years ago.
The Hell Creek Formation occurs in Montana and portions of North Dakota, South Dakota, and Wyoming. In Montana, the Hell Creek Formation overlies the Fox Hills Formation and is the uppermost formation of the Cretaceous period. "Pompey's Pillar" at the Pompeys Pillar National Monument is a small isolated section of the Hell Creek Formation.
It is a series of fresh and brackish-water clays, mudstones, and sandstones deposited during the Maastrichtian, the last part of the Cretaceous period, by fluvial activity in fluctuating river channels and deltas and very occasional peaty swamp deposits along the low-lying eastern continental margin fronting the late Cretaceous Western Interior Seaway. The climate was mild, and the presence of crocodilians suggests a sub-tropical climate, with no prolonged annual cold. The famous iridium-enriched Cretaceous–Paleogene boundary, which separates the Cretaceous from the Cenozoic, occurs as a discontinuous but distinct thin marker bedding within the Formation, near its uppermost strata.
The world's largest collection of Hell Creek fossils is housed and exhibited at the Museum of the Rockies, in Bozeman, Montana. The specimens displayed are the result of the museum's Hell Creek Project, a joint effort between the museum, Montana State University, the University of California, Berkeley, the University of North Dakota and the University of North Carolina which began in 1998. The formation is also a popular location for commercial excavations.
Other articles related to "hell creek formation, formation, hell, formations":
2001, the largest, Tyrannosaurus fossil skeleton known in the Hell Creek Formation near Faith, South Dakota, on 12 August 1990 ... "Stan", in honor of amateur paleontologist Stan Sacrison, was found in the Hell Creek Formation near Buffalo, South Dakota, in the spring of 1987 ... complete skeleton of a juvenile Tyrannosaurus was discovered in the Hell Creek Formation in Montana, by a crew from the Burpee Museum of Natural History of Rockford, Illinois ...
... Name Discovered Museum Museum city Discoverer Formation Location 46 Wankel 1988 Museum of the Rockies Bozeman, MT Kathy Wankel Hell Creek Formation ... Hill City, SD Stan Sacrison Hell Creek Formation Buffalo, South Dakota 50 Jane 2001 Burpee Museum of Natural History Rockford, IL Jane Solem Hell ...
... The Bearpaw Formation, also called the Bearpaw Shale, is a sedimentary rock formation found in northwestern North America ... It overlies the older Two Medicine, Judith River and Dinosaur Park Formations, and is in turn overlain by the Horseshoe Canyon Formation in Canada and the Fox ... A marine formation composed mostly of shale, it represents the last major expansion of the Western Interior Seaway before it completely receded from ...
... Turtles reported from the Hell Creek Formation Genus Species State Stratigraphic position Material Notes Adocus Indeterminate Montana Compsemys C ...
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—State of Oklahoma, U.S. relief program (1935-1943)