Lakota Formation

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Lakota Formation
Stratigraphic range: Barremian
Type Geological formation
Region North America

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

Life forms recovered include the ornithopod dinosaurs Dakotadon lakotaensis and Osmakasaurus depressus, and the ankylosaur Hoplitosaurus marshi. H. marshi is known from "Partial postcranial skeleton [and] osteoderms."[1] D. lakotaensis is known from "Skull, mandible, [and] vertebrae."[2]


  1. ^ "Table 17.1," in Weishampel, et al. (2004). Page 366.
  2. ^ "Table 19.1," in Weishampel, et al. (2004). Page 416.