| Sheep Pass Formation | |
|---|---|
| Stratigraphic range: Latest Cretaceous to Paleogene | |
| Type | Geological formation |
| Sub-units | 6 members (A to F) |
| Location | |
| Region | Nevada |
| Country |  United States |
The Sheep Pass Formation is a geologic formation in Nevada. It preserves fossils dating back to the Paleogene period.
| Mammals | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Apatemys | A. bellus | Near Ely, Nevada. [1] | An apatothere. | ||
| Elymys | E. complexus | Near Ely, Nevada. [2] | A rodent, possibly of the family Zapodidae. | ||
| Ischyromyidae | Near Ely, Nevada. [2] | ||||
| Knightomys | Near Ely, Nevada. [2] | A rodent represented by material not assignable to species. [2] | |||
| Mattimys | Near Ely, Nevada. [2] | A rodent represented by material not assignable to species. [2] | |||
| Microparamys | M. sambucus | Near Ely, Nevada. [2] | A rodent. | ||
| Notharctus | N. tenebrosus | Near Ely, Nevada. [1] | Upper and lower jaws. [3] | A primate. |  |
| Nyctitheriidae | Near Ely, Nevada. [1] | At least one nyctitheriid present. | |||
| Palaeochiropteryx | P. sambuceus | "Elderberry Canyon Quarry in the Egan Range near Ely, White Pine County". [4] | Partial skeleton (USNM PAL 417350) and left dentary (USNM PAL 706598). [4] | A palaeochiropterygid bat. |  |
| Pantolestes | P. longicaudus | Near Ely, Nevada. [1] | A pantolestid. | ||
| Pauromys | P. exallos | Near Ely, Nevada. [2] | A rodent. | ||
| Reithroparamys | R. delicatissimus | Near Ely, Nevada. [2] | A rodent. | ||
| cf. R. huerfanensis | Near Ely, Nevada. [2] | A rodent. | |||
| Sciuravus | S. sp. | Near Ely, Nevada. [2] | A rodent represented by material not assignable to species. [2] | ||
| Sonor | S. handae | "Elderberry Canyon Quarry in the Egan Range near Ely, White Pine County". [4] | Left dentary (USNM PAL 544091). [4] | A vespertilionid bat. | |
| cf. Tetrapassalus | cf. T. mckennai | Near Ely, Nevada. [1] | An epoicotheriid. | ||
| Trogolemur | T. myodes | Near Ely, Nevada. [1] | An anaptomorphine primate. | ||
| Volactrix | V. simmonsae | "Elderberry Canyon Quarry in the Egan Range near Ely, White Pine County". [4] | Right and left dentaries. [4] | An onychonycterid bat. | |
| Amphibians | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Eorubeta | E. nevadensis | Member C (south Egan Range). [5] [6] | A frog. | ||
| Palaeobatrachus | P. occidentalis | Member B. [6] | A frog. | ||
| Crustaceans | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Clinocypris? | C.? sp. | Member B. [5] | An ostracod. | ||
| Cypridea | C. bicostata | Member B. [5] | An ostracod. | ||
| Paracypridopsis? | P.? sp. | Member B. [5] | An ostracod. | ||
| Molluscs | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Hydrobia | Member B. [5] | A snail. | |||
| Valvata | Member B. [5] | A snail. | |||
Trogosus is an extinct genus of tillodont mammal. Fossils have been found in Wyoming, California, and British Columbia, and date from the Eocene between 54.8 and 33.7 million years ago. Trogosus was a bear-like herbivore with a large, short skull and flat feet, and had a skull 35 cm (14 in) long with an estimated body weight of 150 kg (330 lb). It had large, rodent-like incisors, which continued growing throughout the creature's life. Judging from the heavily worn molar teeth, Trogosus fed on rough plant material, such as roots and tubers.
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