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1 December 2010 Discovery of the Middle Triassic Ammonoid Balatonites in the Quy Lang Formation, Thanh Hoa Province, Central Vietnam
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Abstract

The discovery of Balatonites sp. in the lower part of the Quy Lang Formation in the Lang Nuoc area, Thanh Hoa Province, Central Vietnam establishes that this portion of the formation is of late Middle Anisian age. This ammonoid's cooccurrence with Costatoria goldfussi mansuyi and Trigonodus tonkinensis suggests that this widely distributed bivalve assemblage in Asian shallow marine facies is at least partly of late Middle Anisian age, and its discovery may provide an important key for the establishment of a precise biostratigraphic framework for the Middle Triassic of Asia.

© by the Palaeontological Society of Japan
Yasunari Shigeta, Toshifumi Komatsu, Nguyen Dinh Huu, Dang Tran Huyen, and Naoya Iwakiri "Discovery of the Middle Triassic Ammonoid Balatonites in the Quy Lang Formation, Thanh Hoa Province, Central Vietnam," Paleontological Research 14(4), 244-249, (1 December 2010). https://doi.org/10.2517/1342-8144-14.4.244
Received: 30 June 2010; Accepted: 1 October 2010; Published: 1 December 2010
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