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在羌塘西部的三岔口一带泥盆系拉竹龙组中发现规模较大的生物礁———台地前缘礁。下层礁体厚7.28m,上层礁体厚40.98m。两个礁体均为叠置礁,礁体由礁基、礁核、礁顶组成。剖面显示发育有礁前垮塌角砾、礁格架、礁间及礁后环境。泥盆纪生物礁的发现为羌塘盆地寻找油气资源提供了新思路。
In the western Changtang Sanchakou Devonian pull bamboo group found in the larger reef --- platform front edge reef. The lower reef is 7.28m thick and the upper reef is 40.98m thick. Both reefs are stacked reefs, reefs by the reef base, reefs, reefs top composition. Section shows the development of reef collapsed breccia, reef shelves, reefs and the reef environment. The discovery of the Devonian reef provides a new way for the Qiangtang Basin to search for oil and gas resources.