Fossil Shells from The Hachimori Oilfield, Akita Pref.

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Mr. K. Kanai, geologist of the Daido Oil Co., has kindly sent to the Oil Section of the Geological Survey the fossil shells found in the core of Rotary No. 16 well of 463m deep of the Hachimori Oilfield One of those is "Chlanmys kaneharai (Yok, and is buried in the conglomeratic tufaceous mudstone alternating usually with the black mudstone, which is considered as the reservoir rock of this oilregion.The sedimentation environment of the reservoir rock suggested by this fossil occurrence is a open sea bottom condition with strong current of about 100m deep. Such an environment is far difierent from that of the black mudstone. Consequently, from the fact that such a rock alternates with the black mudstone, we can get the following suggestion concerning the study of the geologic history of this region, also based on the based assumption that this rock might be deposited primarily. That is, we are able to suppose the deposition time of the black mudstone. In other words, we can say that the crustal movement might have started at the Funakawa age. Such a supposition, it seems to me, may contribute to the exploration of the oil of this region.
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