Tamayama Formation
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Unit ofFutaba Group
Sub-unitsKohisagawa Member, Irimaza Member
UnderliesUnconformity with the Eocene Iwaki Formation
| Tamayama Formation | |
|---|---|
| Stratigraphic range: | |
| Type | Geological formation |
| Unit of | Futaba Group |
| Sub-units | Kohisagawa Member, Irimaza Member |
| Underlies | Unconformity with the Eocene Iwaki Formation |
| Overlies | Kasamatsu Formation |
| Thickness | ~ 150 metres |
| Lithology | |
| Primary | Sandstone |
| Other | Siltstone |
| Location | |
| Region | northern Honshu |
| Country | Japan |
The Tamayama Formation is a Coniacian-Santonian geologic formation in Japan. Dinosaur remains not referrable to the genus level are among the fossils that have been recovered from the formation.[1] The lower and middle part of the formation consists of braided river sandstone, while the upper portion consists of upper shoreface to inner shelf sandstone.[2] Vertebrate taxa from the formation include Futabasaurus and Cretalamna, along with titanosauriform teeth and neosuchian remains. Seeds of the nymphaeales plant Symphaenale futabensis are also known from this formation.
Paleofauna
- Futabasaurus suzukii
- Cretalamna appendiculata[3]
- Inoceramus
- Apiotrigonia minor[3]
- Glycymeris? sp.[3]
- Archaeromma chisatoi[5]
- Titanosauriformes indet.[4]
- Neosuchia indet.[6]
