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Early Ordovician (Tremadocian and Floian) graptolites from the Than Sa Formation, northeast Vietnam

  • ADRIAN RUSHTON (a1), MARK WILLIAMS (a2), NGUYEN DUC PHONG (a3), TOSHIFUMI KOMATSU (a4), DAVID SIVETER (a2), JAN ZALASIEWICZ (a2), DINH CONG TIEN (a3), NGUYEN VIET HIEN (a3), NGUYEN HUU MANH (a3) and GENGO TANAKA (a5)...
Abstract
Abstract

The lower Palaeozoic marine succession of NE Vietnam accumulated on the South China plate. Despite historical works dating to French colonial times, the stratigraphy and palaeontology of the succession is poorly constrained. Chief amongst the lower Palaeozoic lithostratigraphical divisions is the Than Sa Formation, a c. 1200 m thick succession of clastic rocks of Cambrian and early Ordovician age. Newly collected graptolites (including Rhabdinopora? sp. and Tetragraptus approximatus) from the upper part of the formation identify strata assignable to the Tremadocian and Floian stages of the Lower Ordovician. The same succession also probably records the Cambrian–Ordovician boundary. Our analysis identifies one or more intervals of graptolite-bearing laminated mudstones in the upper part of the Than Sa Formation that may be widespread in NE Vietnam during the early Tremadocian.

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Author for correspondence: phongcs@gmail.com
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This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

L. R. M. Cocks & T. Torsvik 2013. The dynamical evolution of the Palaeozoic geography of eastern Asia. Earth Science Reviews 117, 4079.

A. W. A. Rushton , P. Stone & R. A. Hughes 1996. Biostratigraphic control of thrust models for the Southern Uplands of Scotland. Transactions of the Royal Society of Edinburgh: Earth Sciences 86, 137–52.

A. H. M. VandenBerg & R. A. Cooper 1992. The Ordovician graptolite sequence of Australasia. Alcheringa 16, 3385.

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Geological Magazine
  • ISSN: 0016-7568
  • EISSN: 1469-5081
  • URL: /core/journals/geological-magazine
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