Sponge Spicule Fossils of Qiongzhusian Age in Zhenba County of Southern Shaanxi Province

详细信息   

• 责任者：Zheng Yajuan (School of Earth Sciences and Resources ; Chang＇an University ; Xi＇an 710054 ; China) ; Li Yong
• 刊名：Journal of Earth Sciences and Environment
• 出版年：2012
• 卷期：34(2)
• 关键词：海绵针 ; spicules ; 早寒武世 ; Lower Cambrian ; 陕西 ; Shaanxi Province
• 页码：p.24-30
• 图表：illus., 17 refs.
• 分类号：1100
• issnNo：ISSN1672-6561
• isbnNo：CN61-1423/P

摘要

Sponge spicule fossils are abundant and diverse from carbonatite strata in Xihaoping Member and the lower Shuijingtuo Formation of Lower Cambrian at Zhenba County of southern Shaanxi Province. Based on morphology method, the sponge spicule fossils were described in detail, and the habitat and location of stratum were shown. The results showed that the sponge spicule fossils were in Qiongzhusian Age according to the biostratigraphy data including small shelly fossil and trilobite which were symbiotic with the sponge spicule fossils; there were tetractines, hexactines and triaxon pentactines which were regular, and there were tetraron tetractines, pentaxon pentactines, oxaster and dichostauractines which were irregular; the tetraron tetractines, pentaxon pentactines, oxaster pentaxon and dichobixactines were the new types. Quantity and disparity of Sponge spicule fossils increased fast during Qiongzhusian Age at Zhenba County of southern Shaanxi Province, so that sponges began to propagate and evolve rapidly during Early Cambrian.