Niobrara formation

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• Niobrara Formation — Stratigraphic range: Coniacian Campanian Type Geological formation Sub units Smoky Hill Chalk Member Fort Hays Limestone Member Underlies Pierre Shale …   Wikipedia

• Niobrara — may refer to: Niobrara, Nebraska Niobrara County, Wyoming Niobrara River Niobrara National Scenic River Niobrara Formation, a geological unit Niobrara Township, Knox County, Nebraska This disambiguation page lists articles about distinct g …   Wikipedia

• Niobrara Chalk — The Niobrara Chalk is a geologic formation that was layed down between 87 and 82 million years ago during the Coniacian, Santonian, and Campanian stages of the Late Cretaceous. The chalk formed from the accumulation of coccoliths from… …   Wikipedia

• Milk River Formation — Stratigraphic range: Upper Cretaceous …   Wikipedia

• Lance Formation — ▪ geology       division of rocks in the western United States dating to the end of the Cretaceous Period approximately 66 million years ago and named for exposures studied near Lance Creek, Niobrara county, Wyoming (see Niobrara Limestone).… …   Universalium

• Pteranodon — Taxobox name = Pteranodon fossil range = Mid Late Cretaceous image width = 220px image caption = Pteranodon sternbergi regnum = Animalia phylum = Chordata classis = Sauropsida ordo = Pterosauria subordo = Pterodactyloidea superfamilia =… …   Wikipedia

• Hesperornis — Hargeria redirects here. This is also an (invalid) name of a genus of tanaidacean crustaceans in the family Leptocheliidae. Hesperornis Temporal range: Late Cretaceous, 83.5–78 Ma …   Wikipedia

• Denver Basin — The Denver Basin, sometimes also called the Julesburg Basin, Denver Julesburg Basin (after Julesburg, Colorado), or the D J Basin, is a geologic structural basin centered in eastern Colorado in the United States, but extending into southeast… …   Wikipedia

• Ichthyornis — Temporal range: Late Cretaceous, 95–85 Ma …   Wikipedia

• Nyctosaurus — Eumetazoa Nyctosaurus Temporal range: Late Cretaceous, 85–84.5 Ma …   Wikipedia

• Concretion — For other uses, see enterolith and nodule (geology). Septaria redirects here. For the genus of gastropods, see Septaria (gastropod). Concretions on Bowling Ball Beach (Mendocino County, California) weather out of steeply tilted Cenozoic mudstone… …   Wikipedia