福井市西天田において見つかった含化石石灰岩および含ザクロ石砕屑岩とその意義

概要

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Fossil-bearing limestone associated with shale was newly found at Nishiamada, Miyama area of Fukui City. The fossils seem to be casts of Brachiopoda and Bryozoa, although genus and species names of them are unknown. The limestone is associated with sandstone, shale, and cherty rock. These rocks were intruded and metamorphosed by the Funatsu-type granites. The shale is characterized by partial weak schistosity. Two types of garnet were recognized:one is grossular-type found in the limestone, and the other spessartine-type in theschistose shale. Garnet is present in sandstone, too. These rocks differ from the Hida Metamorphic Rocks and sedimentary rocks of the Mino Terrane. Accordingly, it is very likely that the limestone, sandstone, and shale occurring at Nishiamada belong to the Kuzuryukawa Belt, the Unazuki Belt, or an unknown belt.
2008-11-15