| Monroe Creek Formation | |
|---|---|
| Stratigraphic range: Paleogene | |
| Type | Geological formation |
| Location | |
| Region |  South Dakota |
| Country |  United States |
The Monroe Creek Formation is a geologic formation in South Dakota. It preserves fossils dating back to the Paleogene period.
Color key
| Notes Uncertain or tentative taxa are in small text; |
| Carnivorans reported from the Monroe Creek Formation | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Enhydrocyon | E. crassidens | Shannon County, South Dakota. [1] | Crushed skull (AMNH 12886) & other skull elements. [1] [2] | A hesperocyonine dog. |  |
| E. pahinsintewakpa | Multiple specimens. [1] | A hesperocyonine dog. |  | ||
| Leptocyon | L. delicatus | Porcupine Creek, South Dakota. [2] [3] | Left partial ramus (ACM 31102). [2] [3] | A canine dog, may instead be from the Harrison Formation. |  |
| Mammacyon | M. obtusidens | Wounded Knee Area. [2] | Skull & partial skeleton (ACM 34-41). [2] | A bear-dog. | |
| Neocynodesmus | N. delicatus | Porcupine Creek, Wounded Knee Area. [2] | Left mandible (ACM 31102). [2] | Junior synonym of Leptocyon . | |
| Nimravus | N. sectator | Wounded Knee Area. [2] | Left ramus (AMNH 12882). [2] | Possibly instead from the Harrison Formation. | |
| Nothocyon | N. geismarianus | Wounded Knee Area. [2] | Fragmentary ramus (AMNH 12872). [2] | An arctoid formerly thought to be a canid. | |
| N. near latidens | Wounded Knee Area. [2] | Jaw fragment (AMNH 12873). [2] | Reassigned to Phlaocyon. | ||
| Promartes | P. gemmarosae | Wounded Knee Area. [2] | Nearly-complete skeleton (ACM 31-33). [2] | A mustelid. | |
| Eulipotyphlans reported from the Monroe Creek Formation | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Proscalops | P. sp. indeterminate | Wounded Knee Area. [2] | Isolated molar (SDSM 5899). [2] | A proscalopid. | |
| Rodents reported from the Monroe Creek Formation | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Allomys | A. harkseni | Wounded Knee Area. [2] | Molars. [2] | An aplodontid. | |
| Capatanka | C. brachyceps | Wounded Knee Area. [2] | Skull (AMNH 12902). [2] | A castorid, possibly instead from the Harrison Formation. | |
| Meniscomys | M. sp. indeterminate | Wounded Knee Area. [2] | Isolated tooth (SDSM 59157). [2] | An aplodontid. | |
| Palaeocastor | P. simplicidens | Wounded Knee Area. [2] | Partial cranium (AMNH 12900). [2] | A castorid. | |
| Pleurolicus | P. dakotensis | Wounded Knee Area. [2] | Left ramus (AMNH 12893). [2] | A gopher. | |
| Promylagaulus | P. cf. riggsi | Wounded Knee Area. [2] | Isolated molar. [2] | A mylagaulid. | |
| Ungulates reported from the Monroe Creek Formation | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Nanotragulus | N. ordinatus | Wounded Knee Area. [2] | Mandibles. [2] | May instead be from the Harrison Formation. | |
| Parahippus | P. pristinus | Wounded Knee Area. [2] | Hind feet (AMNH 12922). [2] | May instead be from the Harrison Formation. | |
| Squamates reported from the Monroe Creek Formation | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Peltosaurus | P. granulosus | Sharps Corner, South Dakota. [4] | Multiple specimens. [4] | A glyptosaurine also known from the Sharps Formation. |  |
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