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Bulletin of the Geological Survey of Japan Vol.51 No.4 (2000)

Cover photograh | Table of Contents |

Cover photograh


  A leading quarry in Iwase town, Ibaraki Prefecture, producing about 1 million tons of aggregate yearly which consists mainly of sandstone from Jurassic Yamizo Group. From the surface, forest soil (2-3m), weathered bedrock (10-50m) and fresh bedrock is observed in a vertical range of about 200m.

(Photoed by Yasuo KANAZAWA)

Table of Contents

TitleAuthor PDF
Three kinds of Middle to Late Jurassic pelitic rocks from the Ashio Terrane at the Daigo district in the Yamizo Mountains, central Japan Satoshi NAKAE (113-128) 51-04_01.pdf(11,376KB)
Mineral composition and their origin of forest soils developed on sedimentary rocks in the southern Yamizo mountainous Yoji SEKI, Yutaka KANAI, Hikari KAMIOKA, Katsuhiro TSUKIMURA, Satoshi HAMASAKI, Yasuo KANAZAWA and Terumasa NAKAJIMA (129-141) 51-04_02.pdf(3,640KB)
Triassic and Jurassic radiolarians from the Tokuyama area, Mino terrane, central Japan Satoru KOZIMA and Makoto SAITO (143-165) 51-04_03.pdf(7,607KB)