Fig. 2From: Late Tremadocian (Early Ordovician) reefs on the Yangtze Platform, South China, and their geobiological implications: a synthesisCorrelation chart showing typical Lower Ordovician lithostratigraphic units on the Yangtze Platform. Shadows show the late Tremadocian reef horizons. BGMRAP = Bureau of Geology and Mineral Resources of Anhui ProvinceBack to article page