Fort Atkinson Formation
35 distinct taxa, from 38 fossil occurrences the Paleobiology Database records under this name, spanning 450–446 Mya.
Iowa, Wisconsin, Illinois, Iowa, Illinois · US
35 taxa · 38 fossils · 450–446 MyaFiled under the Maquoketa Group. Members recorded: Upper.
Macrostrat places this rock in the Maquoketa Group, and dates it 449–448 Ma. Macrostrat’s own record
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8 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
- Bighornia patella
- Pleurocystites beckeri
- Anaphragma mirabile
- Archaeocrinus
- Astrocystites
- Atactocrinus wilmingtonensis
- Bothriocidaris
- Calceocrinus
- Carabocrinus
- Crinoidea
- Cryptostomata
- Cupulocrinus latibrachiatus
- Cyclocystoides
- Dendrocrinus
- Ectenocrinus
- Foerstephyllum
- Hudsonaster
- Hypsiptycha
- Iocrinus
- Iowacystis sagittaria
- Lepidocyclus
- Lepidocyclus perlamellosa
- Megamyonia
- Megamyonia knighti
- Oepikina
- Plaesiomys
- Plaesiomys bellistriatus
- Pleurocystites
- Porocrinus
- Protaxocrinus
- Streptelasma
- Strophomenida
- Sygcaulocrinus typus
- Trepostomata
- Trichinocrinus
What else lived thenRank the rock of a period
Counts are of occurrence records, which measure the rock and the fieldwork together.