Jefferson Formation
29 distinct taxa, from 33 fossil occurrences the Paleobiology Database records under this name, spanning 388–372 Mya.
Idaho, Montana, Wyoming · US
29 taxa · 33 fossils · 388–372 MyaMembers recorded: upper, Hyrum, Dark Dolomite.
Macrostrat dates this rock 420–367 Ma. Macrostrat’s own record
Loading coastlines…
4 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
- Thamnopora
- Emanuella
- Proetus
- Allanaria
- Ambothyris
- Ambothyris utahensis
- Amphipora
- Athyris
- Atrypa
- Atrypa oneidensis
- Bensbergia altivolvis
- Brachiopoda
- Cyrtina
- Cyrtina billingsi
- Favosites
- Gastropoda
- Hypothyris
- Loxonema approximatum
- Pelmatozoa
- Peneckiella
- Productella
- Schuchertella
- Shoshonia arctopteryx
- Spirifer
- Spirifera engelmanni
- Stachyodes
- Straparollus
- Straparollus (Straparollus)
- Syringopora
What else lived thenRank the rock of a period
Counts are of occurrence records, which measure the rock and the fieldwork together.