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Fossil fruits from the Hell Creek Formation of Spinifructus antiquus of the palm family , closely related to the genus Astrocaryum. The plants of the Hell Creek Formation generally represent angiosperm-dominated riparian forests of variable diversity, depending on stratigraphic position and sedimentary environment.
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 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.
The Dueling Dinosaurs or Montana Dueling Dinosaurs is a fossil specimen originating from the Hell Creek Formation of Montana. It consists of the fossilized skeletons of a tyrannosaur (generally considered a juvenile Tyrannosaurus rex) and a Triceratops horridus entangled with one another and entombed in sandstone.
The remains of a brow horn suggested that the fossil was a large Triceratops, [3] one of the most common dinosaurs found in the Hell Creek Formation. [4] The remains were scattered over an area of 100 square metres. [5] The fossil's excavation was completed by August 2015. [6] The skeleton is over 60% complete, with a skull that is 75% complete ...
Anzu (named for Anzû, a bird-like daemon in Ancient Mesopotamian religion) is a monospecific genus of caenagnathid dinosaur from North Dakota, South Dakota and Montana that lived during the Late Cretaceous (upper Maastrichtian stage, 67.2-66.0 Ma) in what is now the Hell Creek Formation. [1]
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.
Wakinyantanka (from Lakota Wakíŋyaŋ Tȟáŋka, "great thunderbird") is an ichnogenus of footprint produced by a large theropod dinosaur from the Late Cretaceous Hell Creek Formation of South Dakota. Wakinyantanka tracks are large with three long, slender toes with occasional impressions of a short hallux and narrow metatarsals.