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Y. C. SuN. (The National University of Peking, Peiping) During the past ten years graptolite-bearing strata were repeatedly dis- covered in various localities by the members of the Geological Survey of China, and by the Expedition of the National Peking University and the collections' of graptolites were obtained from differenthorizons (Tremadocian-Valentian). In both Ordovician and Silurian beds of China two facies may be re These two f aciçs do not cognizedthe graptohitic and the shelly facies. represent any distinct period, but characterize different areas rather than different epochs, and owe their characters to the conditions under which they were laid down. As examples we may cite the Ichang limestone and the Yin- chufu formátion in the Lower Ordovicián, and the Machiakou limestone and Pingliang shale in the Middle Ordovician. The relationship of the Mientian group and the Sintan formation in the Lower Silurian is essentially the same. The graptolites are abundantly found in the graptolitic facies which was formed much more slowly, and was evidently laid down under special condi- tions in sediments of the finest of the material derived from the land, and they are rarely found in' limestones. The graptolite assemblage' of each of the formations of
Acta Geologica Sinica (English Edition) – Wiley
Published: Mar 1, 1931
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