THE DISCOVERY OF EOHADROTRETA ZHENBAENSIS (BRACHIOPODA) FROM THE CAMBRIAN SERIES 2 TSINGHSUTUNG FORMATION OF SONGTAO, GUIZHOU
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Abstract:
Micro-brachiopod Eohadrotreta zhenbaensis has been constantly reported in Cambrian Series 2 of South China, such as the Shuijingtuo Formation of southern Shaanxi Province, western Hubei Province and Jiumenchong Formation of east Guizhou Province. Herein, for the first time, we report a large number of E. zhenbaensis collected from the thin limestone of the Cam-brian Stage 4 Tsinghsutung Formation at the Panxin section in Songtao County of Guizhou Province. The specimens of E. zhenbaensis from the Tsinghsutung Formation include the whole 3 development stages, pedicle foramen forming stage, pedi-cle foramen enclosing stage and intertrough increasing stage. The morphological characteristics of E. zhenbaensis reported herein are more similar to the specimens from the Shuijingtuo Formation of southern Shaanxi and western Hubei in the shal-low Yangtze platform, but they are slightly different from these from the Jiumenchong Formation of east Guizhou in slightly deep water slope. In short, the discovery of the E. zhenbaensis from the Cambrian Series 2 Tsinghsutung Formation at Panxin section further expands its paleogeographic distribution of this genus during Cambrian Epoch 2 in South China, which can also enrich the brachiopod assemblages from the Tsinghsutung Formation, and provide new material for the study of the morphologic variations of E. zhenbaensis.
