Lower Cambrian small shelly faunas from Zhejiang (China) and their biostratigraphical implications

作     者：Michael STEINER,Bernd-D. ERDTMANN 

作者机构：TU Berlin Sekr. ACK 14 Ackerstrasse 71～76 13355 Berlin Germany TU Berlin Sekr. ACK 14 Ackerstrasse 71～76 13355 Berlin Germany 

出 版 物：《Progress in Natural Science:Materials International》 (自然科学进展·国际材料(英文))

年 卷 期：2003年第11期

页      面：52-60页

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 

基　　金：ThisisacontributiontotheSino Germanbundle project:“FromSnowballEarthtotheCambrianBioradiation :AMultidisciplinaryAnalysisoftheYangtzePlatform  China” .TheworkwasfinanciallysupportedbytheDeutscheForschungsgesellschaft Bonn (ER96/3 2 1)  theChineseMinis 

主　　题：small shelly fossils Hetang Formation Lower Cambrian Yangtze Platform China. 

摘      要：Despite a long history of research on the Early Cambrian in China most available data on small skeletal fossils concern fossil associations of the shallow carbonate platform. Information on skeletal fossils from marginal shelf environments of the Yangtze Platform is scanty, which may reflect the rarity of fossils in deeper sedimentary environments but is also due to limitation of carbonate distribution and outcrops, difficulties in fossil extraction, and a general research focus on the Precambrian—Cambrian boundary beds on the carbonate platform. Here we present a documentation of Meishucunian to Qiongzhusian small skeletal fossils from the lower Hetang Formation and the chert unit at its base from the Jiangshan region, Zhejiang Province, representing a relatively deep shelf environment compared to the inner shelf region. The earliest association (Meishucunian) from the chert unit underlying the Hetang Formation is mainly characterized by the occurrence of Protohertzina anabarica, P. unguliformis, Fengzuella zhejiangensis, and Kaiyangites novilis, which differs somewhat in composition from SSF-associations of typical inner shelf deposits. The enigmatic skeletal fossil Fengzuella zhejiangensis, which exhibits an unusual secretional growth mode previously unrecognized from the Early Cambrian, is described in detail. A younger (Qiongzhusian) fossil association contains numerous arthropod remains, such as disarticulated spines of arthropods (Jiangshanodus- and Kijacus-type), which have previously been considered as conodont-like fossils, and bradoriid valves.