西南日本，島根県隠岐島後には中新統が広く分布しており，その中でも久見層は日本海拡大最初期の環境変遷を記録している可能性があることから重要である．本研究では久見層模式地に露出する久見層の放散虫化石分析を行った．その結果，久見層上部からはEucyrtidium inflatum帯a亜帯～Lychnocanoma magnacornuta帯下部が認められ，久見層下部からはMelittosphaera magnaporulosa帯が認められた．さらに，久見層最下部から下部にかけてPentactinosphaera hokurikuensisとCyrtocapsella tetraperaの2種によって構成されるP-C群集が産出した．この群集は非海水成層の直上でのみ確認されることから，日本海拡大最初期の特異的な海洋環境を指標する群集である可能性を指摘した．また，珪藻化石および放散虫化石に基づい...

An exceptional exposure of volcaniclastic breccia intercalated with radiolarian cherts and limestones was studied which constitutes a unique block within the Upper Cretaceous Mamonia Mélange in Akamas Peninsula southwestern Cyprus. This breccia, represents lower part sedimentary cover Triassic Phasoula Formation volcanics. The mainly consists clasts metabasalts, diabases, metagabbros, hyaloclas...

Based on a study of 49 conodont and 57 geochemical samples from the Upper Triassic, carbonate-dominated Dengdengqiao Formation, Qinling Basin, China, Carnian conodonts carbon isotope records are first reported. Two genera four species have been identified amongst 87 elements: Mosherella praebudaensis, Mo. longnanensis sp. nov., sp., “Misikella” longidentata. The presence praebudaensis indicates...

The Paleogene carbonate deposits of Pabdeh and Jahrum formations are widespread from the northwest (Dashte Zari area) to southwest Shahrekord region in High Zagros Mountains Iran record lateral upward transition open marine into shallow water environment. Formation shows a succession pelagic hemipelagic limestone, argillaceous chert. It consists planktonic wackestone, pellet-planktonic mudstone...