Reports, Geological Survey of Japan(1968)

Table of contents

Number	Title	Author
No.225	Hydrothermal Rock Alteration of the Matsukawa Geothermal Area, Northeast Japan	Sumi Kiyoshi
No.226	Geological Study on the Anguran Mine, Northwestern Part of Iran	Hirayama Ken
No.227	K-Ar Age Determinations on Granitic and Metamorphic Rocks in Japan	Shibata Ken
No.228	Seismicity and Tectogenesis in Japanese Islands and Their Neighbourhood	Suzuki Yasumoto
No.229	Late Mesozoic to Recent Tectogenesis and its Bearing on the Metamorphism in the New Zealand and in Japan	Hattori Hitoshi
No.230	Genesis of the Fireclay Deposits in Tajimi-Toki District, Gifu Prefecture, Central Japan	Fujii Noriyuki
No.231	Studies on Structural Geology of the Iga Tectonic Basin	Kondo Yoshinori