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BULLETIN OF THE GEOLOGICAL SOCIETY OF CHINA Vol. XXXI, Nos. t-4, pp. 6-78, 9 PIs., 5 Figs., December, 15i ON TUE OCCURRENCE OF ACTINOCERAS IN TUE MIDDLE ORDOVICIAN ROCICS OF SOUTH CHINA WITH DESCRIPTIONS OF ÛASTROPODA* SOME ORDOVICIAN L" (ï B,y C. C. Yü & H. T. Kuo (Institute of Palaeontology, Academia Sinica) with 2 plates & 3 figures E4IWI. 4ti '41 'JUkUû JII ri ;rf Ill 1E E' n '4U o o , Ji1J ; *flL 'Mflu1f 'AJfl' 'i1i31 qtI1Il O 11k Peceived for publication in March 1951. Bulletin of the Geological Society of China * ° 'T lt has been generally held that the Middle Ordovician fauna characterized by the presence of Actinoceras and Maclurites of North American affinity prevails in North China, while a fauna of Orthoceras together with Orthis calligrain,na of European affinity predominates in South China. The reason why the Chinese launas of Middle Ordovician consist of two different types has been already explained by Professor J. S. Lee. He stats1 that "Apart from the raising land, barrier across Central China as a result of .the Huaiyuanian Movement the Palaeocathysian geosyncline seems to have remained essentially the same as in Lower Ordovician. In that
Acta Geologica Sinica (English Edition) – Wiley
Published: Mar 1, 1951
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