Johnson Spring Formation
54 distinct taxa, from 92 fossil occurrences the Paleobiology Database records under this name, spanning 471–450 Mya.
California · US
54 taxa · 92 fossils · 471–450 MyaMacrostrat places this rock in the Eureka Group. Macrostrat’s own record
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2 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
- Streptelasma
- Streptelasma tennysoni
- Crinoidea
- Palaeophyllum
- Ptychopleurella arthuri
- Sowerbyella
- Sowerbyella curdsvillensis
- Streptelasmatidae
- Anthaspidella inyoensis
- Anthozoa
- Bryozoa
- Echinodermata
- Lichenaria
- Lophospira
- Oncoceratidae
- Palaeophyllum rugosum
- Streptelasma prolongatum
- Streptelasmidae
- Zygospira
- Asteroidea
- Brachyelasma bassleri
- Camerella plicata
- Ctenodonta nasuta
- Desmorthis
- Dinorthis
- Dinorthis atavoides
- Ehlersoceras
- Eofletcheria
- Eofletcheria kearsargensis
- Favistella
- Glyptorthis
- Grewingkia whitei
- Hallopora tolli
- Hebertella
- Hormotoma
- Lambeophyllum
- Lambeophyllum profundum
- Lichenaria goodrichi
- Lichenaria sisyphi
- Lingulasma
The 40 most often recorded, of 54.
What else lived thenRank the rock of a period
Counts are of occurrence records, which measure the rock and the fieldwork together.