Ishido Formation
61 distinct taxa, from 88 fossil occurrences the Paleobiology Database records under this name, spanning 143–121 Mya.
Gumma, Gunma, Nagano · JP
61 taxa · 88 fossils · 143–121 MyaFiled under the Sanchu Group. Members recorded: Lower.
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5 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
- Pterotrigonia (Pterotrigonia)
- Astarte
- Astarte (Astarte)
- Gervillaria
- Heteroceras
- Palaelophacmaea
- Barremites
- Brunonia
- Entolium
- Eohydnophora sanchuensis
- Eugyra
- Grammatodon (Nanonavis)
- Isastrea
- Lytocrioceras
- Montlivaltia xainzaensis
- Placocoenia ohinataensis
- Pterotrigonia
- Rastellum carinatum
- Aconeceras
- Acrioceras tabarelli
- Amygdalum
- Anahamulina
- Anahamulina subcylindrica
- Barremitites strettostoma
- Calliphylloceras
- Ceratosiphon
- Confusiscala
- Cyathophora steinmanni
- Cymatoceras neocomiense
- Desmoceras difficile
- Eriphyla (Eriphyla)
- Eugyra digitata
- Eugyra neocomiensis
- Eugyra sugiyamai
- Gervillia (Gervillia)
- Hamiticeras
- Heminautilus japonicus
- Hexanchiformes
- Hoploparia kamimurai
- Isognomon (Isognomon)
The 40 most often recorded, of 61.
What else lived thenRank the rock of a period
Counts are of occurrence records, which measure the rock and the fieldwork together.