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Niranohama Formation

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Journal Article
Journal: Geology
Published: 01 October 2012
Geology (2012) 40 (10): 911–914.
... crop out along the Pacific coast of northeastern Japan ( Fig. 2 ), consist of the Niranohama and Hosoura Formations. The former has a middle to late Hettangian age (199–196 Ma), based on the occurrence of the age-diagnostic ammonite Alsatites onoderai (e.g., Matsumoto, 1956 ; Takahashi, 1969...
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Series: Geological Society, London, Geology of Series
Published: 01 January 2016
DOI: 10.1144/GOJ.2
EISBN: 9781862397064
...) Group which comprises the Niranohama Formation and overlying Hosoura Formation. The Niranohama Formation rests unconformably on the Saragai Group and consists of sandstone and sandy mudstone deposited in a brackish-littoral environment (Hayami 1961a) and yielded abundant bivalves and middle-upper...
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Series: Geological Society, London, Special Publications
Published: 01 January 2009
DOI: 10.1144/SP315.8
EISBN: 9781862395633
... of A. biformatus by a shallower base ( Kriwet 1995 ). Asteracanthus is reported from the Jurassic of Japan ( Cappetta 1987 ; Goto et al. 1991 ; Goto 1994 ) on the basis of some anterior teeth ( Goto 1994 ). The tooth figured by Goto et al. (1991) from the Hettangian Niranohama Formation is not well...
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