Ordovician-Silurian boundary graptolites of the Satun area, southern peninsular Thailand

SACHIKO AGEMATSU; KATSUO SASHIDA; SIROT SALYAPONGSE; APSORN SARDSUD

doi:10.2517/prpsj.10.207

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SACHIKO AGEMATSU,¹ KATSUO SASHIDA,¹ SIROT SALYAPONGSE,² APSORN SARDSUD²

¹Graduate School of Life and Environmental Sciences, University of Tsukuba, Ibaraki, 305-8572, Japan (e-mail: ) agematsu@arsia.geo.tsukuba.ac.jp
²Geological Survey Division, Department of Mineral Resources, Rama, VI, Bangkok, 10400, Thailand

Abstract

Black shale exposed north of Satun, southern peninsular Thailand, lies upon Upper Ordovician limestone and includes abundant graptolites. This fauna contains Normalograptus pseudovenustus pseudovenustus (Legrand, 1986) and Normalograptus sp. N. pseudovenustus is a reliable index species of an interval containing the Ordovician-Silurian boundary. Based on the range of this species, the graptolite-bearing black shale is inferred to be of latest Ordovician age, with the study section including the O/S boundary. The taxonomy of these two graptolite species is discussed in this study.

Citation Download Citation

SACHIKO AGEMATSU, KATSUO SASHIDA, SIROT SALYAPONGSE, and APSORN SARDSUD "Ordovician-Silurian boundary graptolites of the Satun area, southern peninsular Thailand," Paleontological Research 10(3), 207-214, (1 September 2006). https://doi.org/10.2517/prpsj.10.207

Received: 13 March 2006; Accepted: 1 May 2006; Published: 1 September 2006

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