Just out | Early Spathian (Late Olenekian, Early Triassic) Radiolaria from the Bac Thuy Formation, northeastern Vietnam @ Revue de Micropaléontologie


Just out @ Revue de Micropaléontologie


Title: 

Early Spathian (Late Olenekian, Early Triassic) Radiolaria from the Bac Thuy Formation, northeastern Vietnam


Author(s):

Osamu Takahashia, Takumi Maekawab, Toshifumi Komatsub, Phong Nguyen Ducc, Tien Dinh Congc, Hung Doan Dinhd


Abstract:

This article presents a rather well-preserved radiolarian fauna recovered from black siliceous mudstone occurring in the Ky Cung River section 02 (KC02) of the Bac Thuy Formation, Lang Son Province, northeastern Vietnam. The KC02 section has been regionally correlated on the basis of the first appearance of the diagnostic Spathian ammonoid Tirolites. The ammonoid assemblage associated with radiolarians indicates that the black mudstone sample is early Spathian in age (Late Olenekian). The radiolarian fauna is characterized by a very low diversity of entactinarians of the family Hindeosphaeridae and of to another unidentified family, and by the absence of nassellarians. Here we describe two new species of entactinarians, Parasepsagon primitivus nov. sp. and Eptingium? reticulatum nov. sp. The composition of the fauna suggests that the beginning of diversification of Mesozoic-type radiolarians occurred at the beginning of the Spathian on the eastern margin of the tropical Tethys.


READ IT HERE:

http://www.sciencedirect.com/science/article/pii/S0035159817300053

Lurdes Fonseca

Assistant Professor and Researcher at University of Lisbon
Sociologist (PhD), Paleontologist (Researcher in Micropaleontology), Majors in Sociology and Biology, Minor in Geology. Main interests in Paleontology: Microfossils, Molecular fossils, Paleobiology and Paleoecology. (read more about me)
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