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重新研究了西藏申扎木纠错地区下拉组剖面,发现该地区下拉组从空谷晚期到吴家坪期连续,露头出露较好,下与昂杰组泥页岩整合接触,上与木纠错组白云质灰岩整合接触。该剖面根据不同的岩性及生物组合可分为三段,其中前二段亦在申扎县北的下拉地区较为发育,时代为空谷晚期至卡匹敦期;但下拉地区由于受断层和褶皱影响强烈,未完全保存第三段,而该段在木纠错剖面中出露较好,并在其含燧石结核灰岩中发现了牙形类Clarkina liangshanensis(Wang)和类Codonofusiella schubertelloides Sheng,确认其时代为乐平世吴家坪期,首次确认下拉组的上部可以延伸至吴家坪期。
Re-studied the Xizhamu correctional area pull-down group section in Tibet, found that the pull-down group in the area from the late Valley to Wujiaping period continuous, outcrop is better, with integrated contact with the shale of Angjie Formation, upper and wood correction group Dolomitic limestone integrated contact. According to different lithology and bio-assemblage, the profile can be divided into three sections, of which the first two sections also developed well in the northern pull-down area of the northern Xincan County, and the era is from Late Valley to Cappadocia. However, due to the fault and fold The third paragraph was not completely preserved, and the section was well exposed in the wood-correcting section. Clarkina liangshanensis (Wang) and Codonofusiella schubertelloides Sheng were found in chert The era of Leping Wu Jiaping period, for the first time confirmed that the upper part of the pull-down group can be extended to Wujiaping period.