Abstract
Recent identification of Triassic and Jurassic microfossils, especially Jurassic radiolarians, within chert and other siliceous sedimentary rocks in “eugeosynclinal” facies of what was known as the Chichibu Paleozoic Group in Southwest Japan has fostered a great revolution in regards to reconstruction of tectonic events for the Paleozoic and Mesozoic. This chapter presents the basic stratigraphy and structure of some areas of the Chichibu Terrane, particularly in the southern half of the “Chichibu Geosynclinal Area,” and presents new biostratigraphic data from siliceous sedimentary rocks in selected parts of Shikoku and Kyushu. The chapter discusses important observations on the mode of occurrence of chert and siliceous claystone, and suggests that the chert and siliceous claystone are oceanic or pelagic sediments that were deposited on basaltic rocks and were accreted together with arc- or continent derived Middle and Upper Jurassic terrigenous clastic sediments along two subduction zones during the Late Jurassic.
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