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The Hell Creek Formation in Montana overlies the Fox Hills Formation and underlies the Fort Union Formation, and the boundary with the latter occurs near the Cretaceous–Paleogene boundary (K–Pg), which defines the end of the Cretaceous period and has been dated to 66 ± 0.07 Ma old. [6]
Metatherians reported from the Hell Creek Formation; Genus Species State Stratigraphic position Material Notes Images Alphadon [116] A. marshi. Montana; North Dakota [116] An alphadontid. genus of small, primitive mammal that was a member of the Metatheria, a group of mammals that includes modern-day marsupials. A. cf. marshi. Montana; South ...
The Hell Creek Formation is a well-known and much-studied fossil-bearing formation (geological region) of mostly Upper Cretaceous and some lower Paleocene rock that stretches across portions of Montana, North Dakota, South Dakota, and Wyoming in North America.
Trierarchuncus (meaning "captain hook," after its single-clawed hands) is a monotypic genus of alvarezsaurid theropod which includes a single species, Trierarchuncus prairiensis, mainly known from fossils found in deposits of the Hell Creek Formation in Montana.
Hell Creek Formation, Montana & South Dakota, USA A caenagnathine caenagnathid , originally thought to be a species of Chirostenotes . Anzu measured about 3 to 3.5 meters (9.8 to 11.5 ft) long, up to 1.5 m (4 ft 11 in) tall at the hips and 200 to 300 kg (440 to 660 lb) in weight.
Hell Creek Formation: End of Cretaceous/start of Cenozoic (65.76 Ma ± 0.15 Mya) North America: United States: Apparent Lagerstätte and killing field capturing the ...
Frenchman Formation, Hell Creek Formation, Horseshoe Canyon Formation, Lance Formation, Prince Creek Formation (Late Cretaceous, Campanian to Maastrichtian) Canada ( Alberta Saskatchewan) United States ( Alaska Colorado Montana North Dakota South Dakota Wyoming) Known from multiple well-preserved specimens, including a few "mummies".
Map of locations yielding Anzu specimens (stars). Several large skeletons from the late Maastrichtian Hell Creek Formation of Montana and South Dakota were initially referred to as "cf. Chirostenotes", [4] though more recent studies concluded that they represent new species.