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GEOREF RECORD

Affinities and taphonomy of a Cambrian discoid from Guizhou, south China

Yang Xinglian, Zhao Yuanlong, Wu Weiyi, Sun Zongyuan, Zheng Haolin and Zhu Yajie
Affinities and taphonomy of a Cambrian discoid from Guizhou, south China (in An examination of life history and behavioral evolution across the Ediacaran-Cambrian transition, James D. Schiffbauer (editor) and Shuhai Xiao (editor))
Journal of Paleontology (March 2014) 88 (2): 339-347

Abstract

Disc-like fossils from siltstones of the Taozichong Formation (Cambrian) in the Qingzhen area, Guizhou, South China are reported here. They are similar to some Ediacaran and Phanerozoic discoidal fossils, and assigned to Tirasiana? disciformis? Palij, 1976. Based on the study of 43 specimens, dewatering or fluid escape structures, soft-sediment loading, scratch circles or other inorganic origins are ruled out, and the fossil is interpreted as a discoidal body fossil of unknown affinities rather than trace fossils. Energy-dispersive X-ray spectroscopy and elemental mapping analyses reveal that the discoid fossils contain higher concentrations of C, Fe, and P than the surrounding matrix, indicating the possible presence of pyrite, apatite, and organic carbon as a result of authigenic mineralization in association with decay and early diagenetic processes. The possible presence of extracellular polymeric substance suggests that the discs were surrounded by thin microbial mats composed primarily of extracellular polymeric substances, which facilitated their fossilization by promoting conditions that are favorable to secondary mineral precipitation. The new specimens provide useful information about the phylogenetic affinities of these early discoidal fossils and help us to better understand the taphonomic modes of non-biomineralizing organisms in Ediacara-type and Burgess Shale-type biotas.


ISSN: 0022-3360
EISSN: 1937-2337
Coden: JPALAZ
Serial Title: Journal of Paleontology
Serial Volume: 88
Serial Issue: 2
Title: Affinities and taphonomy of a Cambrian discoid from Guizhou, south China
Title: An examination of life history and behavioral evolution across the Ediacaran-Cambrian transition
Author(s): Yang XinglianZhao YuanlongWu WeiyiSun ZongyuanZheng HaolinZhu Yajie
Author(s): Schiffbauer, James D.editor
Author(s): Xiao, Shuhaieditor
Affiliation: Guizhou University, College of Resource and Environment, Guiyang, China
Affiliation: University of Missouri at Columbia, Department of Geological Sciences, Columbia, MO, United States
Pages: 339-347
Published: 201403
Text Language: English
Publisher: Paleontological Society, Lawrence, KS, United States
References: 58
Accession Number: 2014-036952
Categories: General paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. col., 3 plates, 2 tables, geol. sketch map
N26°33'00" - N26°33'00", E106°28'00" - E106°28'00"
Secondary Affiliation: Virginia Polytechnic Institute and State University, USA, United StatesGuizhou Institute of Technology, CHN, China
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, The Paleontological Society. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201423
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