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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 ...
Hell Creek fauna; Trierarchuncus in light pink Trierarchuncus represents one of the few known alvarezsaurids from North America. [ 5 ] [ 2 ] [ 1 ] At 66 million years old, it is the youngest known alvarezsaurid and is one of the youngest non-avian dinosaurs in general, like its contemporaries Tyrannosaurus and Triceratops .
Tanis is a paleontological site in southwestern North Dakota, United States. It is part of the heavily studied Hell Creek Formation, a geological region renowned for many significant fossil discoveries from the Upper Cretaceous and lower Paleocene.
Prehistoric fauna of the Hell Creek Formation— from its paleontological sites, located in North America. Pages in category "Hell Creek fauna" The following 84 pages are in this category, out of 84 total.
The Magnusavis holotype specimen, CCM V2019.5.1, was discovered in sediments of the Hell Creek Formation on BLM land in Carter County, Montana, United States.The specimen consists of part of the right tarsometatarsus missing metatarsal IV and the top of II and III, in addition to an isolated phalanx from an unknown toe.
Analysis of turtle survivorship in the Hell Creek Formation shows a minimum of 75% of turtle species survived. [102] Following the extinction event, turtle diversity exceeded pre-extinction levels in the Danian of North America, although in South America it remained diminished. [103]
In the Hell Creek Formation, composed predominantly of floodplain and riverine deposits, Myledaphus teeth are very common, accounting for a significant fraction of vertebrate remains found in microsites. [7] Skeleton of M. bipartitus