Cook Ranch Formation
28 distinct taxa, from 32 fossil occurrences the Paleobiology Database records under this name, spanning 37–32 Mya.
Montana · US
28 taxa · 32 fossils · 37–32 MyaMembers recorded: middle, lower.
Macrostrat dates this rock 34–23 Ma. Macrostrat’s own record
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1 distinct localities, where the rock is now rather than where it was laid down. Tectonics draws the world it belonged to.
When
What has been found
- Chadrolagus emryi
- Leptomeryx speciosus
- Palaeolagus burkei
- Palaeolagus temnodon
- Adjidaumo minimus
- Brachygaulus leistneri
- Brachyrhynchocyon dodgei
- Copedelphys stevensoni
- Cylindrodontidae
- Eumys
- Eumys elegans
- Heliscomys
- Herpetotherium
- Herpetotherium fugax
- Hesperocyon gregarius
- Hyracodon
- Ischyromyidae
- Ischyromys
- Leptomeryx
- Leptomeryx evansi
- Mesohippus
- Oligoscalops
- Palaeolagus
- Paradjidaumo trilophus
- Poebrotherium
- Prosciurus
- Soricidae
- Trigenicus profectus
What else lived thenRank the rock of a period
Counts are of occurrence records, which measure the rock and the fieldwork together.