延长植物群在塔里木的发现兼论中国晚三叠世植物地理分区的西端界线

Appearence of Yenchang Flora in Tarim with Discussion on the West Teminal of Late Triassic Phytogeographical Boundary of China

报道延长植物群——晚三叠世北方型植物群在塔里木的发现 ,结合塔里木中三叠世和吐鲁番晚三叠世以及两地早、中侏罗世均产北方型植物群的证据 。

The well known Yenchang flora represented mainly by Danaeopsis fecunda Halle, Bernoullia zeilleri P'an, Asterothera szeiana (P'an), Todites shensiensis (P'an), Cladophlebis raciborshii Zeiller, and Cl. kaoiana Sze from the Tarim Basin is reported and figured in the present paper. This is a typical late Triassic flora of the Northern China Province and in view of the obvious evidence of northern fossil plants which yield from the middle Triassic, low middle Jurassic strata in both the Tarim and the Turpan Basins, it indicates that the Tianshan Mts. were not able to stop the extension of the northern Yenchang flora into the Tarim Basin during the late Triassic, and meanwhile the southern late Triassic plants such as the Xuejiahe flora could not crossed the Kunlun Mts. and reached the Tarim area. Therefore the west terminal of late Triassic phytogeographical boundary should be the Kunlun Mts. instead of the Tianshan Mts. as the senior writer mentioned before(Wu Shun qing, 1978, 1983).