140. The Carboniferous Foraminifera from the Sosan District, North Heian-Dô, Tyôsen

Abstract

During their survey of the Sosan area in 1931 Prof. T. KOBAYASHI and Mr. Shoen KIN discovered a small lens of dark grey “Staffella” limestone on the northeastern road-side of Shinmaliudo, Nanmen, Sosan-gun, North Heian-DO.
The limestone-bearing formation lies on the Toufangian limestone disconformably on the west side and is cut by faults on its northeast and southeast sides. It occupies a small area within the Cambro-Ordovician terrain and consisits of the lower part of fine purple shale and the upper of reddish purple sandstone, and the fossiliferous limestone-lens is found near the top. Finding the primitive fusulinids in the limestone, they referred this thin formation (some 30m. thick) to the lower part of the Koten Series.
By courtesy of Prof. Teiichi KOBAYASHI of the Geological Institute, Imperial University of Tokyo, I had an opportunity of studying his thin sections of the limestone during my stay at the Institute in this summer.
Here I wish to express my most sincere gratitude to Prof. KOBAYASHI for his valuable suggestion given to me in his laboratory. My best thanks are also due to Prof. Haruyosi HUZIMOTO of the Higher Normal School of Tokyo for his kind advices on my palaeontological study.