There are 6 matches
| Collection | Authorizer | Collection name | Reference |
|---|---|---|---|
| 270 | J. Sepkoski | SW Richey Field-Williston Basin, Zone A, Deadwood Fm. Tremadoc - Cambrian-Ordovician - Montana | Lochman-Balk and Wilson (1967) |
| 275 | J. Sepkoski | SW Richey Field-Williston Basin, Deadwood Fm., zone b (upper Tremadoc) Tremadoc - Cambrian-Ordovician - Montana | Lochman-Balk and Wilson (1967) |
| 69027 | P. Wagner | Shell Oil Co., #32-33B. 10214'. N.P. Unit, S.W. Richey field (= Williston Basin, Deadwood Fm., upper Tremadoc, zone d, Montana in Sepkoski 1998) Demingian - Ordovician 1 - Montana | Lochman (1965) |
| 210717 | P. Wagner | 10226', Shell Oil Co., #32-33B, N.P. Unit, S.W. Richey field (= Williston Basin, Deadwood Fm., upper Tremadoc, zone d, Montana in Sepkoski 1998) Gasconadian - Ordovician 1 - Montana | Lochman (1964) |
| 210718 | P. Wagner | Shell Oil Co., #32-33B. 10229' N.P. Unit, S.W. Richey field (= Williston Basin, Deadwood Fm., upper Tremadoc, zone d, Montana in Sepkoski 1998) Gasconadian - Ordovician 1 - Montana | Lochman (1964) |
| 232902 | P. Wagner | 10434', Shell Oil Co., #32-33B, N.P. Unit, S.W. Richey field (= Williston Basin, Deadwood Fm., upper Tremadoc, zone d, Montana in Sepkoski 1998) Gasconadian - Ordovician 1 - Montana | Lochman (1964) |