Abstract
Correlative study of the Ordovician chitinozoan biostratigraphy in China with graptolite and conodont biozones, and comprehensive analysis of the sequence- and event-strati-graphic indicated that 17 chitinozoan zones and 5 main chitinozoan diversification events subsequently occurring could be recognized in the Ordovician System of China. The 5 events comprise: event 1—appearance of the earliest Ordovician chitinozoans, event 2—appearance of C. symmetrica, event 3—juvenile radiation of chitinozoans, event 4—appearance of chitinozoans with high diversity, and event 5—development of chitinozoans of deep-water facies. The age and feature of each event and its relation with the sea-level change and other geological event are discussed.
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