Futaba Group

{{short description|Geologic formation in Japan}}

{{Infobox rockunit

| name = Futaba Group

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| type = Geological group

| age ={{fossilrange|Coniacian|Santonian}}

| prilithology =Sandstone, siltstone, conglomerate

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| region = northern Honshu

| country =Japan

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| 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

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|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.Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607. It consists of both fluvial and shallow marine sediments.{{Cite journal|last=Ando|first=Hisao|last2=Seishi|first2=Masao|last3=Oshima|first3=Mitsuharu|last4=Matsumaru|first4=Tetsuya|date=1995|title=Fluvial-Shallow Marine Depositional Systems of the Futaba Group (Upper Cretaceous). Depositional facies and sequences.|url=http://joi.jlc.jst.go.jp/JST.Journalarchive/jgeography1889/104.284?from=CrossRef|journal=Journal of Geography (Chigaku Zasshi)|volume=104|issue=2|pages=284–303|doi=10.5026/jgeography.104.284|issn=0022-135X|doi-access=free}} The plesiosaur Futabasaurus was found in this unit (specifically the Tamayama Formation).