Features of the Cambrian Niutitang Biota from Changyangou Village，Jinsha County, Guizhou Province

The Niutitang Biota in Changyangou Village, Jinsha County, just as in Heishapo Village, Zunyi County where the biota was named, has abundant fossils which include 25 genera, belonging to Sponges, Arthropoda and Algae. Among Sponges, the Demospongea has 8 genera which are Leptomitus, Leptomitella，Paraleptomitella, Takakkawia, Crumillospongia, Choia, Choiaella and Allantospongia, accounting for 57% of Sponges; the Hexactinellida has 5 genera which are Kunmingella, Emeiella, Hanchiangella, Tsunyiella and Songlinella, accounting for 36%; the genus Solactiniella Mehl and Reitner, 1993 is gen. et sp. indet. There are 8 genera in Arthropoda, dominated by Bradoriida with 5 genera which are Kunmingella, Emeiella, Hanchiangella, Tsunyiella and Songlinella; 2 genera of large bivalved arthropod animals are Isoxys and Perspicaris; 1 genus of Trilobita is Tsunyidiscus, the most important trilobite of Niutitang Formation. Three genera of Algae are Zunyiphyton, Sinocylindra and Vendotaenia. In contrast with Heishapo Niutitang Biota in Zunyi, sponges in Zhangyangou Niutitang Biota in Jinsha are more abundant, dominated by Demospongea. The two biotas are not identical with Jinsha having 2 genus of trilobites and 5 genera of Bradoriida while Zunyi having 4 genera of trilobites and 2 genera of Bradorrida. Zunyi and Jinsha have 4 genera and 3 genera of algaes respectively and share 2 genera. Though both Jinsha and Zunyi located in the shallow water of Yangtze Platform, the difference between the two biotas implies the nonidentity of the sedimentary environment in the two places. Both of the two biotas possess the earmarks of the Chengjiang Biota.