However, there is recent evidence that the supposed contrast between faunas of North Chi- na and South China may not be as profound as claimed, for example, by Chen and Teichert (1988) Zhou and Fortey (1986) reviewed the Ordovician trilobites of the North China plat- form and found considerable similarity between the North China and the Yangtze platforms in the Tremadoc, even including species in com- mon. Differences increased in the Arenig. How- ever, Chen Ting-en (in Chen et al, 1995) listed similar nautiloid faunas in the Arenig of the Hunghuayuan Formation (South China) and the Liangchiashan Formation (North China) These include several genera listed (e.g., by Laurie and Burrett, 1992, Fig.2) from the lower Ordovician of Sibumasu, and presumably regarded by them as typical of the North China platform. Of the Chisiloceras-Cochilioceras Assemblage Zone Chen (in Chen et al, 1995 p.16) states it not only is widely distributed in the different plates of China, but also in North America and NW Europe (i.e., Baltica)