Futaba Group | |
Type: | Geological group |
Prilithology: | Sandstone, siltstone, conglomerate |
Region: | northern Honshu |
Country: | Japan |
Subunits: | Ashizawa Formation, Kasamatsu Formation, Tamayama Formation |
Underlies: | Unconformity with Paleogene Shiramizu Group |
Overlies: | Early Cretaceous Granite, Permian shale and sandstone |
Thickness: | Over 300 metres |
Period: | Late Cretaceous |
The Futaba Group is a Late Cretaceous geologic group in Japan. Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus.[1] It consists of both fluvial and shallow marine sediments.[2] The plesiosaur Futabasaurus was found in this unit (specifically the Tamayama Formation).