Spechts Ferry Formation
155 distinct taxa, from 190 fossil occurrences the Paleobiology Database records under this name, spanning 457–450 Mya.
Illinois, Iowa, Iowa, Illinois, Iowa, Wisconsin, Minnesota, Iowa, Wisconsin, Illinois · US
155 taxa · 190 fossils · 457–450 MyaFiled under the Galena Group.
Macrostrat places this rock in the Decorah Group. Macrostrat’s own record
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6 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
- Aparchites
- Eurychilina
- Cupulocrinus
- Euprimitia
- Leperditella
- Parabolbina
- Saccelatia
- Winchellatia
- Bromidella
- Clathrospira conica
- Cupulocrinus jewetti
- Dicranella
- Eomonorachus intermedius
- Hemicystites
- Heterotrypa
- Homotrypa
- Isotelus gigas
- Michelinoceras
- Primitiella
- Spyroceras
- Abludoglyptocrinus charltoni
- Acanthocrania
- Acanthocrania setigera
- Agelacrinites
- Alaskadiscus subacutus
- Amecystis woodi
- Amphilichas
- Amplexopora
- Archinacella deleta
- Aristerella
- Ateleocystites
- Bairdiocypris
- Bassleratia
- Bathyurus (Raymondites) longispinus
- Bellornatia
- Bollia
- Bucania halli
- Bullatella
- Bumastoides
- Byrsolopsina
The 40 most often recorded, of 155.
What else lived thenRank the rock of a period
Counts are of occurrence records, which measure the rock and the fieldwork together.