White River Formation
186 distinct taxa, from 442 fossil occurrences the Paleobiology Database records under this name, spanning 37–19 Mya.
Wyoming, Colorado, South Dakota · US
186 taxa · 442 fossils · 37–19 MyaMembers recorded: Horsetail Creek, upper, Vista, lower, Big Sand Draw Sandstone Lentil, Beaver Divide Conglomerate.
Macrostrat dates this rock 35–20 Ma. Macrostrat’s own record
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14 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
- Brontotheriidae
- Ischyromys veterior
- Hesperocyon gregarius
- Brachyrhynchocyon
- Equidae
- Helodermoides tuberculatus
- Didelphidae
- Eotylopus reedi
- Hypisodus
- Leptomeryx speciosus
- Palaeolagus temnodon
- Dinictis
- Hyracodon priscidens
- Megalagus brachyodon
- Merycoidodon culbertsonii
- Centetodon chadronensis
- Cylindrodon
- Cylindrodon natronensis
- Douglassciurus jeffersoni
- Subhyracodon
- Trigonias
- Adjidaumo minimus
- Agriochoerus
- Apternodus brevirostris
- Archaeotherium coarctatum
- Bathygenys
- Bathygenys alpha
- Chadrolagus emryi
- Cylindrodon solarborus
- Daphoenictis
- Epoicotherium unicum
- Hesperocyon
- Hyracodon
- Leptomeryx mammifer
- Miniochoerus forsythae
- Namatomys lloydi
- Oligoryctes altitalonidus
- Penetrigonias dakotensis
- Poebrotherium
- Stibarus
The 40 most often recorded, of 186.
What else lived thenRank the rock of a period
Counts are of occurrence records, which measure the rock and the fieldwork together.