Arikaree Formation
99 distinct taxa, from 287 fossil occurrences the Paleobiology Database records under this name, spanning 32–12 Mya.
Wyoming, Nebraska, North Dakota, Montana · US
99 taxa · 287 fossils · 32–12 MyaMembers recorded: basal.
Macrostrat dates this rock 22–20 Ma. Macrostrat’s own record
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7 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
- Oreolagus nebrascensis
- Borophaginae
- Mesogaulus novellus
- Brachycrus laticeps
- Brachyerix macrotis
- Mesoscalops scopelotemos
- Archaeolaginae
- Equinae
- Geomyoidea
- Mioheteromyinae
- Miospermophilus wyomingensis
- Protolabis heterodontus
- Protospermophilus kelloggi
- Camelidae
- Gerrhonotus
- Schaubeumys sabrae
- Alphagaulus vetus
- Ameiseophis robinsoni
- Brachycrus
- Cynarctoides acridens
- Harrymys irvini
- Merycodus sabulonis
- Testudinidae
- Desmatolagus schizopetrus
- Mustelidae
- Paracynarctus kelloggi
- Perognathinae
- Pseudocemophora antiqua
- Tylocephalonyx skinneri
- Antilocapridae
- Barbouromeryx
- Brachycrus rusticus
- Charina prebottae
- Cosoryx (Paracosoryx) wilsoni
- Crotaphytidae
- Limnoecus
- Parvericius montanus
- Protomarctus optatus
- Rodentia
- Schizodontomys harkseni
The 40 most often recorded, of 99.
What else lived thenRank the rock of a period
Counts are of occurrence records, which measure the rock and the fieldwork together.