The Conodonts of the Marginal Areas around the Ordos Basin, North China

The research work of this book was carried out from 1984 to 1988. Totally 41 sectins in 18 different areas around the Ordos Basin were measured as shown in Text-fig. 1 (in Chinese), including 3 Cabrian sections, 28 Ordovician sections, 2 Silurian sections and 8 Carboniferous sections. Altogether 2500 conodont samples were processed, and th recovery of them is about one third. In terms of quantity, the Ordovician conodonts are most numerous, th Carbonifrous conodonts are secondary in abundance, there are only a few Cambrian and Silurian conodonts.