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The stratigraphy and sedimentary features of the Sakamotozawa Formation, the type sequence, for the Lower Permian Sakamotozawa Series of Japan, are described in this paper. The type Sakamotozawa Forma...tion, about 270 m thick, is divided into two subformations separated by an unconformity. The Lower Subformation consists of a basal conglomerate and succeeding beds of sandstone and shale in the lower part and thin-bedded, mostly bioclastic limestone in the upper part. The Upper Subformation is made up of thin conglomerate at the base, thin- to thick-bedded bioclastic limestone in the lower part and sandstone and shale with some lenticules of limestone in the upper part. The limestone consists primarily of a number of small units, each of which is less than 25 m in thickness and characteristically represents a cyclic sedimentation. The litho- and bio-facies of the limestone as well as the stratigraphic sequence suggest an oscillating sedimentation under a gradual change of depositional conditions from a very shallow environment of a probably restricted water (possibly a lagoonal onβ), with an intermittent desication of water at times, to a slightly deepened somewhat off－shore environment of open neritic sea.続きを見る
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1.Introduction 2.Descriptions of stratigraphy 3.Notes on sedimentary features
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Mendeley出力
16_03_p265