Early Cenomanian (Cretaceous) Ammonoids Utaturiceras and Graysonites From Hokkaido, North Japan (Studies of the Cretaceous Ammonites From Hokkaido and Sakhalin-Xcv).
BULLETIN OF THE GEOLOGICAL SURVEY OF JAPAN
doi 10.9795/bullgsj.54.131
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January 1, 2003
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National Institute of Advanced Industrial Science