Abstract
The coal-beainq Tertiary in the area is the Suzuka group which includes two formations, the lower, the Kabuto and the upper, the Akira., TheKabuto formation may be divided into the following members in ascending order: Hudesute conglomerate (300m), Kannonyama complex of conglomerate and sandstone (500m), Hagiwara alternation of sandstone and mudstone (350m+) - Hamaebayama boulder conglomerate (180m?, an especiallized facies in the Hagiwara alternation)., It seems to be deposited in freshwaters as indicated by the occurrence of many freshwater shells and plant leaves in the Hagiwara alternation., Among these shells, two species, Arconaia hosonoi Suzuki et OYAMA and Crislaria kuboi, SUZUKI ET OYAMA are determined., Whereas the Akira formation, which is subdivided into two members, the lower, the Isiyama sandstone and the upper, the Himetani complex of sandstone and mudstone may be marine deposits, because many shallow sea shells such as Volsella akanedaensis (KURODA), Brachidontes n., sp., and Katelysia n., sp., are found from the Himetani member., These fossils indicate most probably the Early Miocene (F1) age of the Suzuka group.,
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