Early Tremadocian (Ordovician) graptolite biostratigraphy and correlation |
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| Institution: | 1. Institute of Geology, Free University of Berlin, Germany;2. Wuhan Center of China Geological Survey (Innovation Center for Geological Science and Technology of Central South China and Hubei Key Laboratory of Paleontology and Geological Environment Evolution), Wuhan, China |
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| Abstract: | A revision of the early Tremadocian graptolites of the genus Rhabdinopora shows that Rhabdinopora proparabola from the Xiaoyangqiao section, Dayangcha, North China is the oldest species of the genus. Early Tremadocian species of Rhabdinopora can be differentiated easily by the construction of their nemata. The earliest species, Rhabdinopora proparabola, lacks a nema, while a multibranched nema is present in Rhabdinopora campanulatum (= Rhabdinopora parabola). The Rhabdinopora proparabola, Rhabdinopora campanulatum, Rhabdinopora flabelliformis (Anisograptus matanensis Biozone) and Rhabdinopora anglica biozones can be correlated worldwide. A short interval at the base of the Ordovician System does not contain any planktic graptolites. |
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| Keywords: | Ordovician Tremadocian graptolite biostratigraphy |
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