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Late Permian to Middle Triassic radiolarian faunas from northern Thailand

Published online by Cambridge University Press:  20 May 2016

Katsuo Sashida
Affiliation:
Institute of Geoscience, University of Tsukuba, Ibaraki, 305–8571, Japan
Hisayoshi Igo
Affiliation:
Institute of Geoscience, University of Tsukuba, Ibaraki, 305–8571, Japan
Shuko Adachi
Affiliation:
Institute of Geoscience, University of Tsukuba, Ibaraki, 305–8571, Japan
Katsumi Ueno
Affiliation:
Department of Earth System Science, Faculty of Science, Fukuoka University, Fukuoka, 814–0180, Japan
Yoshimichi Kajiwara
Affiliation:
Institute of Geoscience, University of Tsukuba, Ibaraki, 305–8571, Japan
Nikorn Nakornsri
Affiliation:
Department of Mineral Resources, Rama 6, Bangkok, 10400, Thailand
Apsorn Sardsud
Affiliation:
Department of Mineral Resources, Rama 6, Bangkok, 10400, Thailand

Abstract

Moderately well-preserved Late Permian to Middle Triassic radiolarians are identified in chert beds that occur in the Shan-Thai Block of northern Thailand. These radiolarians are identical to the faunas of the Late Permian Neoalbaillella ornithoformis and N. optima Assemblage Zones and the Triassic Parentactinia nakatsugawaensis and Triassocampe coronata Assemblage Zones reported in chert sequences of Japan. We discovered the radiolarian faunas, apparently indicating Late Permian and Early Triassic ages, in almost continuous sequences of chert and shale exposed in the north of Chiang Mai. The occurrence of these radiolarian faunas provides important data to solve the P/T (Permian/Triassic) boundary in pelagic sequences. Our present discovery also furnishes significant data to reconstruct the paleobiogeography of Mainland Thailand during Late Permian to Middle Triassic times. Fifty species belonging to 35 genera, including three unidentified genera, are investigated taxonomically. Four new species Pseudospongoprunum? chiangdaoensis, Cenosphaera igoi, Cenosphaera? rugosa, and Tlecerina? apsornae are described.

Type
Research Article
Copyright
Copyright © The Paleontological Society

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