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Lakota Formation : ウィキペディア英語版 | Lakota Formation
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 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.〔Sames, B., Cifelli, R.L., and 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: 207–224.〕 ==Vertebrate paleofauna==
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