Lakota Formation

Lakota Formation
Lakota Formation
Stratigraphic range:
Type	Geological formation
Sub-units	Chilson Member. Fuson Member
Underlies	Fall River Formation
Overlies	Morrison Formation
Thickness	200 to 500 feet (60 to 150 m)
Lithology
Primary	Sandstone
Other	Shale, Coal, Conglomerate
Location
Region	North America
Country	United States
Type section
Named for	Lakota Native American tribe
Named by	Darton
Year defined	1899

The Lakota Formation is a sequence of rocks of early Cretaceous (Berriasian to Barremian) age from Western North America. Located in South Dakota, the name of the formation is derived from the Lakota Native American tribe.

There are two units of the Lakota Formation, the Chilson Member (upper Berriasian to Valanginian) and the underlying Fuson Member (upper Valanginian to early Barremian). A Berriasian-Valanginian age for the Chilson Member has been extrapolated by means of ostracods and charophytes.^[1]

^ Sames, B.; Cifelli, R. L.; Schudack, M. (2010). "The nonmarine Lower Cretaceous of the North American Western Interior foreland basin: new biostratigraphic results from ostracod correlations, and their implications for paleontology and geology of the basin—an overview". Earth-Science Reviews. 101 (3–4): 207–224. doi:10.1016/j.earscirev.2010.05.001.

[1] Sames, B.; Cifelli, R. L.; Schudack, M. (2010). "The nonmarine Lower Cretaceous of the North American Western Interior foreland basin: new biostratigraphic results from ostracod correlations, and their implications for paleontology and geology of the basin—an overview". Earth-Science Reviews. 101 (3–4): 207–224. doi:10.1016/j.earscirev.2010.05.001.

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