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The earliest Foraminifera from southern Shaanxi, China
Hua Hong1; Chen Zhe (陈哲)2; Yuan XunLai (袁训来)2; Xiao ShuHai3; Cai YaoPing1

Vase-shaped microfossils (VSMs) described herein mainly occur as isolated individuals in thin bedded siltstone and silty carbonate of the Gaojiashan Member of the upper Ediacaran Dengying Formation (ca. 551-541 Ma). Although these fossils are abundant, chained tests or other types of colonial aggregates have not been observed. Specimens in the siltstones can easily be isolated from the host rocks by ultrasonic vibrators. Compared with the co-occurring fossils Gaojiashania and Conotubus, VSMs are rarely pyritized, yet they are always three-dimensionally persevered with little deformation, suggesting that their tests were sturdy and possibly mineralized. Petrological observation and elemental mapping reveal two types of tests that are respectively calcareous and siliceous in composition. Calcareous tests typically consist of two to three crypto-crystal laminae, somewhat resembling bilamellar walls of foraminifers. Siliceous tests consist of fine-grained particles agglutinated with siliceous cement, similar to agglutinated walls of foraminifers. The Gaojiashan VSMs are broadly similar, at least in gross morphology, to the testate amoebae-like VSMs, but their relative large sizes (600-2400 mu m) and possibly mineralized (rather than organic) tests argue against this comparison. They also show some similarities to other protozoans, especially tintinnids. However, tintinnids have robust pesudochitinous loricae consisting of both secreted and agglutinated materials. Moreover, tintinnid loricae differ in shape from the Gaojiashan VSM tests in having a constricted aboral end (sometimes with a caudal appendix) and a flaring oral opening. If the Gaojiashan VSMs are indeed related to foraminifers, they indicate that foraminifers were important players in late Ediacaran communities.

KeywordGaojiashan Biota Vase-shaped Microfossils Foraminifera
WOS KeywordVase-shaped Microfossils ; Chuar Group ; Grand-canyon ; Agglutinated Foraminifera ; Testate Amebas ; Cloudina ; Lagerstatte ; Supergroup ; Evolution ; Examples
Funding ProjectNational Basic Research Program of China[2006CB806400] ; National Natural Science Foundation of China[40872021] ; Program for New Century Excellent Talents in University ; State Key Laboratory of Continental Dynamics and Northwest University[09YYB01]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000284845600003
Funding OrganizationNational Basic Research Program of China ; National Natural Science Foundation of China ; Program for New Century Excellent Talents in University ; State Key Laboratory of Continental Dynamics and Northwest University
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Document Type期刊论文
Corresponding AuthorHua Hong
Affiliation1.NW Univ Xian, Early Life Inst, State Key Lab Continental Dynam, Dept Geol, Xian 710069, Peoples R China
2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Peoples R China
3.Virginia Polytech Inst & State Univ, Dept Geosci, Blacksburg, VA 24061 USA
Recommended Citation
GB/T 7714
Hua Hong,Chen Zhe ,Yuan XunLai ,et al. The earliest Foraminifera from southern Shaanxi, China[J]. SCIENCE CHINA-EARTH SCIENCES,2010,53(12):1756-1764.
APA Hua Hong,Chen Zhe ,Yuan XunLai ,Xiao ShuHai,&Cai YaoPing.(2010).The earliest Foraminifera from southern Shaanxi, China.SCIENCE CHINA-EARTH SCIENCES,53(12),1756-1764.
MLA Hua Hong,et al."The earliest Foraminifera from southern Shaanxi, China".SCIENCE CHINA-EARTH SCIENCES 53.12(2010):1756-1764.
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