和歌山県広川地域の下部白亜系西広層の貝化石

概要

論文の詳細を見る
The Nishihiro Formation cropping out the Nishihiro at the Hirokawa area, Wakayama Prefecture, is characterized by the predominance of white feldspathic and/or quartz arenite. lt yields brackish-water pelecypods (Tethyan fauna) and gastropods, together with plant remains. Among the identified species, Aguilerella cf. nagatoensis, Eomiodon matsumotoi, Hayamina carinata, and Tetoria cf. yoshimoensis are common or diagnostic. From the faunal aspects and lithological characters, the formation especially resembles the Yamabu Formation of the Haidateyama area, the kawaguchi Formation of the Yatsushiro area, the Yoshimo Formation of the Shimonoseki area, the Birafu Formation of the Monobe area and the Matsuo Group of the Toba area, and can be correlated approximately with the Valanginian to Hauterivian. Lithic, faunal data and geologic age of the Nishihiro Formation indicate that the upper member of the Ikenoue Formation corresponds to marine in origin which constitute a part of the Nishihiro Formation.
熊本大学の論文
2003-11-28