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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 people 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.
The Fuson Member takes its name from rock exposures in Fuson Canyon, a valley on the eastern side of the Black Hills.
| Dakotadon | D. lakotaensis | Chilson Member | "Skull, mandible, and vertebrae.""Table 19.1," in Weishampel, et al. (2004). Page 416. | An Iguanodontia iguanodont |
| Hoplitosaurus | H. marshi | Chilson Member | "Partial postcranial skeleton and osteoderms.""Table 17.1," in Weishampel, et al. (2004). Page 366. | An ankylosaur belonging to Polacanthidae |
| Osmakasaurus | O. depressus | Chilson Member | Portions of both ilia, anterior part of the blade of one pubis, an incomplete sacrum, centrum of the last sacro-dorsal, 12 caudal vertebrae, 1 thoracic rib and many fragments | An ankylopollexian iguanodont |
| MacronariaIndeterminate | Chilson Member | Left humerus and right metacarpal I | A macronarian related to Camarasaurus | |
| Bolodon | B. hydei | Chilson Member | Right M2 | A Plagiaulacidae multituberculate |
| Infernolestes | I. rougieri | Chilson Member | Right lower M1 | A spalacotheriid trechnotherian. |
| Lakotalestes | L. luoi | Chilson Member | Right upper molar (M5?) | A Dryolestidae |
| Passumys | P. angelli | Chilson Member | Right M1A plagiaulacid multituberculate | |
| Lakotemys | L. australodakotensis | Chilson Member | Two shells and a partial skull | A baenid paracryptodire |
Other vertebrate remains found within the Lakota Formation include a fish scale from the gar Lepisosteus and a crocodile tooth
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