Confirmation of the Permian/Triassic boundary in deep-sea sedimentary rocks : earliest Triassic conodonts from black carbonaceous claystone of the Ubara section in the Tamba Belt, Southwest Japan

Abstract

We found earliest Triassic (Griesbachian) conodont, Hindeodus parvus, from the basal part of the black carbonaceous claystone of the Ubara Permian/Triassic boundary section in the Tamba Belt. We also obtained Late Permian (Changxingian) conodonts from the underlying gray siliceous claystone as already reported from other P/T boundary sections. The lithologic boundary between the gray siliceous claystone and the black carbonaceous claystone is confirmed to be the Permian/Triassic boundary in deep-sea sedimentary rocks.