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1 June 2007 Lower Triassic bivalve fossils from the Song Da and An Chau Basins, North Vietnam
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Abstract

In North Vietnam, the Hua Tat, Pa Khom and Lang Son Formations yield abundant Lower Triassic bivalves. The occurrence of Eumorphotis sp. cf. E. multiformis, represents the first fossil reported from the Hua Tat Formation, while Claraia aurita, C. concentrica, and C. intermedia multistriata are found in the upper Lang Son Formation. The Pa Khom Formation contains C. intermedia multistriata, Claraia sp., and Lopha sp. The occurrence of C. intermedia multistriata indicates that the Pa Khom Formation and the upper Lang Son Formation are Olenekian in age. These Claraia spp. are found in wave-dominated nearshore deposits characterized by hummocky cross stratification and wave-ripple laminations, although Claraia in other areas is generally found in deep-sea mudstone.

TOSHIFUMI KOMATSU and DANG TRAN HUYEN "Lower Triassic bivalve fossils from the Song Da and An Chau Basins, North Vietnam," Paleontological Research 11(2), 135-144, (1 June 2007). https://doi.org/10.2517/1342-8144(2007)11[135:LTBFFT]2.0.CO;2
Received: 28 February 2006; Accepted: 1 December 2006; Published: 1 June 2007
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