Graptolites across the Ordovician-Silurian boundary from Jingxian, Anhui. Nanjing Institute of Geology and Palaeontology, Symposium on the Cambrian-Ordovician and Ordovician-Silurian boundaries (1983: Nanjing). Stratigraphy and palaeontology of systemic boundaries in China. Ordovician Silurian boundary (1)., Anhui Science and Technology Publishing House, Nanjing, 1984: 1-517. Chapter pagination: 309-388. 321 [Zoological Record Volume 125]