Diversification of Ordovician Chitinozoans from South China, and Its Relationships with Environment Changes

摘要

INTRODUCTION A more systematic research on the Ordovician chitinozoans in China started in the early 1980s. Hou and Wang (1982) reported several Ordovician chitinozoan fossils found in the Huanghuachang Section, Yichang, Hubei Province. Some articles on chitinozoans were subsequently published from the Yangtze platform and its margin and from the Tarim block by Chinese geologists in the last 20 years. Wang and Chen (2004) preliminarily discussed the diversification of Ordovician chitinozoans from China based on those data. However, the abovementioned studies appear to be relatively limited and sporadic in comparison with comparatively widespread Ordovician strata and rich chitinozoan succession in China.