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

Published online by Cambridge University Press:  24 April 2017

ADRIAN RUSHTON ,
MARK WILLIAMS ,
NGUYEN DUC PHONG ,
TOSHIFUMI KOMATSU ,
DAVID SIVETER ,
JAN ZALASIEWICZ ,
DINH CONG TIEN ,
NGUYEN VIET HIEN ,
NGUYEN HUU MANH  and
GENGO TANAKA
ADRIAN RUSHTON
Affiliation:
Department of Earth Sciences, The Natural History Museum, Cromwell Road, London SW7 5BD, UK
MARK WILLIAMS
Affiliation:
Department of Geology, University of Leicester, Leicester LE1 7RH, UK
NGUYEN DUC PHONG*
Affiliation:
Vietnam Institute of Geosciences and Mineral Resources (VIGMR), 67 Chien Thang, Van Quan, Ha Dong, Ha Noi, Vietnam
TOSHIFUMI KOMATSU
Affiliation:
Faculty of Advanced Science and Technology, Kumamoto University, 2-39-1, Kurokami, Chuo-ku, Kumamoto 860-8555, Japan
DAVID SIVETER
Affiliation:
Department of Geology, University of Leicester, Leicester LE1 7RH, UK
JAN ZALASIEWICZ
Affiliation:
Department of Geology, University of Leicester, Leicester LE1 7RH, UK
DINH CONG TIEN
Affiliation:
Vietnam Institute of Geosciences and Mineral Resources (VIGMR), 67 Chien Thang, Van Quan, Ha Dong, Ha Noi, Vietnam
NGUYEN VIET HIEN
Affiliation:
Vietnam Institute of Geosciences and Mineral Resources (VIGMR), 67 Chien Thang, Van Quan, Ha Dong, Ha Noi, Vietnam
NGUYEN HUU MANH
Affiliation:
Vietnam Institute of Geosciences and Mineral Resources (VIGMR), 67 Chien Thang, Van Quan, Ha Dong, Ha Noi, Vietnam
GENGO TANAKA
Affiliation:
Center for Marine Environment Studies, Kumamoto University, Kamiamakusa City, Kumamoto 861-6102, Japan
*
†Author for correspondence: [email protected]
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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.

Keywords

GraptolitesOrdovicianFloianTremadocianSouth China plateVietnam
Type
Original Article
Information
Geological Magazine , Volume 155 , Issue 7 , October 2018 , pp. 1442 - 1448
Copyright
Copyright © Cambridge University Press 2017 

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