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GEOREF RECORD

Middle Permian non-fusuline foraminifers from the middle part of the Xiala Formation in Xainza County, Lhasa Block, Tibet

Zhang Yichun, Shen Shuzhong, Zhang Yujie, Zhu Tongxing and An Xianyin
Middle Permian non-fusuline foraminifers from the middle part of the Xiala Formation in Xainza County, Lhasa Block, Tibet
Journal of Foraminiferal Research (April 2016) 46 (2): 99-114

Abstract

A non-fusuline foraminiferal fauna consisting of 20 genera and 27 species was documented from the middle part of the Xiala Formation at the Mujiucuo section of Xainza County, central Tibet. This fauna consists mostly of porcelaneous-walled genera such as Agathammina, Midiella, Hemigordiopsis, Neodiscus, Multidiscus, and a new genus Megacrassispirella Zhang gen. nov. These taxa indicate a Midian (Capitanian) age. The climatic amelioration, triggered by climatic warming after the Late Paleozoic Ice Age or by northern drift of the Lhasa Block, promoted diversification of the non-fusuline foraminifers in the middle part of the Xiala Formation. Warm oceanic currents also played an important role in bringing biota from low latitude areas to the northern Gondwanaland margin through the newly-formed Neotethys Ocean. One new genus, Megacrassispirellagen. nov., with Megacrassispirella xarlashanensis (Wang, 1986) emend. Zhang as type species, and one new species, Agathammina vachardi Zhang sp. nov., are described.


ISSN: 0096-1191
EISSN: 1943-264X
Coden: JFARAH
Serial Title: Journal of Foraminiferal Research
Serial Volume: 46
Serial Issue: 2
Title: Middle Permian non-fusuline foraminifers from the middle part of the Xiala Formation in Xainza County, Lhasa Block, Tibet
Affiliation: Chinese Academy of Sciences, Nanjing Institute of Geology and Palaeontology, State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing, China
Pages: 99-114
Published: 201604
Text Language: English
Publisher: Cushman Foundation for Foraminiferal Research, Ithaca, NY, United States
References: 109
Accession Number: 2016-051621
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. col., 1 table, geol. sketch map
N30°55'60" - N30°55'60", E88°42'00" - E88°42'00"
Secondary Affiliation: China Geological Survey, CHN, China
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Cushman Foundation for Foraminiferal Research. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201625
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