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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.
South Dakota [9] Lower to upper Hell Creek Formation [10] 40 specimens [11] A genus of prehistoric sharks in the family Hybodontidae. It makes up 0.4% of the remains of the vertebrates of the Hell Creek Formation. [8] Myledaphus [28] M. pustulosus [28] Montana [28] North Dakota [9] South Dakota [9] Lower to upper Hell Creek Formation. [10]
Map of the Hell Creek and Lance Formations in western North America. 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. ...
Three North Dakota boys made the extraordinary discovery of a highly rare Tyrannosaurus rex fossil that could change what we know about dinosaurs. ... which began as an ordinary hike in the Hell ...
Sam Fisher, his sons, Jessin and Liam, then 10 and 7, and their cousin Kaiden Madsen, who was 9, had been amateur fossil hunters for years and knew that the area — the Hell Creek Formation ...
Throughout the remainder of the Cenozoic, North Dakota's climate cooled and dried. The state's swamps vanished and their inhabitants became extinct. In their place woodlands formed. The climate got colder still and eventually glacial activity reshaped the state's landscape. At this time North Dakota was home to mammoths and mastodons. [1]
Dakota (specimen NDGS 2000) is the nickname given to an important Edmontosaurus fossil found in the Hell Creek Formation in North Dakota. It is about 67 million years old, [ 1 ] placing it in the Maastrichtian , the last stage of the Cretaceous period .
The fossil itself has a somewhat less poetic name: NDGS 10838. It includes a near-complete skull with a bony ridge over the eyes as well as jaws and some skeletal parts, including 11 ribs and 12 ...