Stratigraphy of the Sagara Group and the Kakegawa Group in Haibara district, Shizuoka Prefecture, Central Japan

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  • 静岡県榛原郡地域の相良層群と掛川層群の層序
  • シズオカケン ハイバラグン チイキ ノ サガラソウグン ト カケガワソウグン

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Abstract

The late Neogene series, the Sagara and the Kakegawa Groups, are distributed in. Shizuoka Prefecture, Central Japan. Although the stratigraphy and the biostratigraphy of these series have been studied by many workers as one of the standard Neogene type series on the Pacific coast of Japan, the stratigraphic boundary and relationships between the Sagara and the Kakegawa Groups may be still indistinct. The Sagara Group is divided into the Sugegaya Formation and the Oyori Formation in ascending order. The Sugegaya Formation is subdivided into the Tokigaya alternation of conglomerate and sandstone and the Sugegaya alternation. The Oyori Formation is composed with the Hirugaya alternation, the Oyori mudstone, the Takao conglomerate, the Sakaguchi conglomerate and the Kiriyama mudstone rich alternation. The Kakegawa Group is divided into the Katsuma Formation, the Hagima Formation and the Tanno Formation in ascending order. The Katsuma Formation is composed with the Katsuma conglomerate, the Kakigaya sandstone, the Katsuta mudstone rich alternation, the Araya sandstone and the Nakajima conglomerate. The Hagima Formation is subdivided into the Hagima sandstone rich alternation and the Arakawa mudstone rich alternation. The Tanno Formation is subdivided into the Kawakami sandstone rich alternation and the Isobe mudstone rich alternation. This study has revealed that the basal horizon of the Kakegawa Group is the base of the Nakajima conglomerate and the Katsuma conglomerate in Kiriyama-Katsuma area, the base of the Kakigaya sandstone in Hagima area and the base of the Hagima sandstone rich alternation in Niino area. The relationship between the Sagara and Kakegawa Groups is.thought to be unconformity in the northern area, because the basal horizon of the Kakegawa Group onlaps on the Sagara Group in the northern area and it downlaps in the southern area.

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