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A good display of Cretaceous deposits as well as overlying Eocene ones is known in the island of Shishijima, northern Kagoshima Prefecture. The main part of this island is composed of the Goshonoura g...roup (? Albian-Cenomanian-? Turonian), which forms a syncline and is the southwestern extension of this group of its type area (Goshonourajima). It constitutes a large sedimentary cycle in view of the nature of sandstone and fossil molluscs and can be subdivided into six members in the same manner as the stratigraphy of the type area, though some lateral change in facies is presumable. The Himenoura group (? Coniacian-Santonian-Campanian) is rather fragmentarily distributed in this island. Although its argillaceous strata are intensely sheared and faulted, the correlation with the group of its type area (Amakusa-kamishima) is partly possible by the common occurrence of four zonal species of Inoceramus. The Palaeogene deposits cover unconformably the Himenoura group as seen at the northern part of this island. They are accompanied by reddish beds at the base which are probably originated from some thick palaeo-soil.続きを見る
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