Lakota Formation
| Lakota Formation Stratigraphic range: Berriasian-Barremian |
|
|---|---|
| Type | Geological formation |
| Sub-units | Chilson Member. Fuson Member |
| Location | |
| Region | North America |
| Country |
 United States
|
| Type section | |
| Named for | Lakota Native American tribe |
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.
D. lakotaensis
Chilson Member
"Skull, mandible, [and] vertebrae."
H. marshi
Chilson Member
"Partial postcranial skeleton [and] osteoderms."
An ankylosaur belonging to Polacanthidae
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
Unnamed basal macronarian
Chilson Member
left humerus and right metacarpal I
A macronarian related to Camarasaurus
B. hydei
Chilson Member
right M2
A plagiaulacid.
I. rougieri
Chilson Member
right lower M1
...
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