中国早石炭世珊瑚动物的地理分区

THE CLASSIFICATION OF THE ZOOGEOGRAPHICALREGIONS OF LOWER CARBONIFEROUSCORALS IN CHINA

中国海相的早石炭世地层分布广泛,除了华北古陆、东南古陆、上扬子古陆、祁连古陆、康滇古陆、塔里木古陆和松花江古陆等外,几乎遍布于全国各地。根据沉积的特点可将中国早石炭世划分为四个沉积区域和三种沉积类型:即天山—兴安区,大致位于北纬42°以北,天山—阴山隆起带以北的地带,简称“中国北方槽区”。

The marine Lower Carboniferous corals spread widely in many provinces of China except in a few oldands. Based on the study of corals, four zoogeographical regions are apparent for the Lower Carboniferous corals in China, namely, the South China region, the Northwest China region, the Tianshan-Xiugan region and the South Xizang region. The Aikuanian coral fauna shows distinguishable divisions of zoogeographical regions. The characteristic form of the coral fauna develops into 'regional element', which comprises such genera as Cystophrentis and Pseu-douralinia in the South China zoogeographical region; Siphonophyllia and Hum-boldtia in the Northwest China zoogeographical region; Cyathaxonia and Hapsip-phyllum in the Tianshan zoogeographical region) Ekvasoptyllum and Sychnoelasma in the South Xizang zoogeographical region.The coral fauna of Tatang Age is very abundant, and is represented by the genera Thysanophyllum and Yuanophyllum. They are widely distributed in the zoogeographical regions of South China, Northwest China and Tianshan-Xingan.This coral fauna may be called the'Sinican type'. It includes such genera as Thysanophyllum, Kwangsiphyllum, yuanophgllum, Kueichouphyllum, Arachnolasma, Neoclisiophyllum, Heterocaninia,etc. It must be pointed out, however, that the heterocorals of Tatang Age are very abundant and are extensively distributed in China, they appearing in the Late Tatang age.