First Occurrence of Early Triassic Conodonts from the Lang Son Formation, Northeastern Vietnam

Takumi Maekawa; Toshifumi Komatsu; Yasunari Shigeta; Dang Tran Huyen; Dinh Cong Tien

doi:10.2517/2015PR014

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Takumi Maekawa,¹ Toshifumi Komatsu,¹ Yasunari Shigeta,² Dang Tran Huyen,³ Dinh Cong Tien³

¹Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan (e-mail: ) komatsu@sci.kumamoto-u.ac.jp
²Department of Geology and Paleontology, National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba, Ibaraki 305-0005, Japan
³Department of Paleontology and Stratigraphy, Research Institute of Geology and Mineral Resources, Ministry of Industry, Hanoi, Vietnam

Abstract

The Early Triassic conodonts Eurygnathodus costatus Staesche, E. hamadai (Koike), Neospathodus cristagalli (Huckriede), and Ns. pakistanensis Sweet are newly reported from the upper part of the Lang Son Formation in Lang Son City, northeastern Vietnam. This association and particularly E. costatus and E. hamadai indicate the lower Smithian (lower lower Olenekian). Thus, the geological age of the upper part of the Lang Son Formation ranges from Induan to early Olenekian, and the stage boundary lies within the upper part of the formation.

Citation Download Citation

Takumi Maekawa, Toshifumi Komatsu, Yasunari Shigeta, Dang Tran Huyen, and Dinh Cong Tien "First Occurrence of Early Triassic Conodonts from the Lang Son Formation, Northeastern Vietnam," Paleontological Research 19(4), 312-320, (1 October 2015). https://doi.org/10.2517/2015PR014

Received: 4 February 2015; Accepted: 1 June 2015; Published: 1 October 2015

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