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Lithostratigraphy and sedimentological features of the Lower Cretaceous W akino Subgroup in and around Yamada Park, south of Kokura, Kitakyushu City, were examined on the basis of detailed mapping and... observation of sedimentary facies. The W akino Subgroup can be regarded lithologically as a elastic sequence accumulated under the open dilute lake system, in which three major facies assemblages are distinguished; the alluvio-fluvial, marginal lacustrine, and offshore lacustrine facies. The sequence of the present area consists largely of the beds of marginal lacustrine facies accompanied by those of alluvio-fluvial facies in the lower. It occurs repeatedly owing to asymmetric frexural folds, trending east-northeast and verging toward the north. The beds of offshore lacustrine facies, on the other hand, are exposed in fault contact with those of marginal lacustrine facies on the east. With respect to the characteristics of the sedimentary facies, the sequence of this area may be comparable to the Sengoku and N yoraida or W akamiya Formations in the type area.続きを見る
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