On the Hayama group of the Miura Peninsula, Kanagawa Prefecture, South Kanto, Japan

In the central part of the Miura Peninsula, the Hayama group, which uncomformably underlies the Miura group, is distributed in two areas, namely, the Akiya-Takeyama area and the Hayama-Kinugasa area., In the Akiya-Takeyama area, the group is divided into the following seven formations in discending order (3), (3') and (3") are the same horizon., (5) Kinugasa mudstone, (1700m+in thickness)., (4) Nakayama fine sandstone, (1100m±in thickness)., (3) Oyama tuffaceous sandstone, (1100m±in thickness); (3') Osawa sandston and conglomerate, (900m±); (3") Sakanodai tuff-breccia, (400m±in thickness)., (2) Hatadateyama alternation of sandstone and shale, (1000m± in thickness)., (1) Morito mudstone, (1400m+in thickness)., These formations are folded, and several masses of serpentine have been intruded along the three axes of the folds., In the Hayama-Kinugasa area, the group is divided into the following two formations in discending order., (2) Tateisi shale, (350m+in thickness)., (1) Takeyama siltstone, (1500m+in thickness)., These formations are monoclinic in structure, strike east, and dip about 60° north., Although no important fossils have been discovered in these formations, on the basis of stratigraphy, the group is thought to be Japanese lower Miocene (F1 in IKEBE'S Letter Nomination) in age., My paper on the Miura group will be published in this Journal in the near future.