论赣西北东岭地区生物礁的形成时代

On a Taking Shape Era of the Reefs in Dongling Area of Northwest Jiangxi

依据赣西北东岭剖面上二叠统长兴组上段第5层(厚34.50m)和第8层(厚10.40m)藻海绵生物礁的赋存状况,及其下伏地层(第2层,厚2m;第0层,厚8.20m)所产牙形剌ClarkinachangxingensisClarkinadeflecta组合带的属种特征及其丰度,笔者认为,东岭地区生物礁的形成时代为晚二叠世晚长兴期.

In accordance with the natural endowstates of the algae Sponges reefs,the fifth bed (thickness 34.50 m)and the eighth bed (thickness 10.40 m)at the upper sector of the Changxing formation,in Dongling section of Northwest Jiangxi,and the Genus and Species charcteristics and abundances of the conodonds Clarkina changxingensis Clarkina deflecta assemblage zone at the lower stratum(The second bed,thickness 2 m;the noughth bed,thickness 8.20 m).The Taking Shape Era of the reefs in Dongling Area belong to the late Changxingian of the late Permian.