Otter Formation
43 distinct taxa, from 50 fossil occurrences the Paleobiology Database records under this name, spanning 347–323 Mya.
Montana · US
43 taxa · 50 fossils · 347–323 MyaMacrostrat places this rock in the Big Snowy Group, and dates it 333–326 Ma. Macrostrat’s own record
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9 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
- Ostracoda
- Caninia
- Conodonta
- Pugnoides
- Agassizocrinus
- Algae
- Allorisma
- Ammodiscus
- Amplexizaphrentis
- Bellerophontoidea
- Blothrocrinidae
- Brachiopoda
- Buxtonia arizonensis
- Cleiothyridina hirsuta
- Composita
- Composita laevis
- Cranaena circularis
- Crinoidea
- Dictyoclostus
- Dinotocrinus
- Diploblastus glaber
- Eumetria
- Leiorhynchus
- Limipecten
- Limipecten otterensis
- Linoproductus
- Longiclava tumida
- Michelinia meekana
- Millerella
- Myalina parallela
- Nucleospira
- Nuculana
- Orbiculoidea
- Orthotetes
- Permophorus
- Petrocrania modesta
- Schizophoria depressa
- Septimyalina
- Snowycrinus
- Spirifer
The 40 most often recorded, of 43.
What else lived thenRank the rock of a period
Counts are of occurrence records, which measure the rock and the fieldwork together.