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塔里木盆地西南皮山、和田一带有一套巨厚的陆相地层,关于这套地层的划分对比和时代确定,长期以来争论很大.早年被称为叶尔羌系,依据所产植物化石将其划归上二叠统到中、下侏罗统.1962年,斯行健等将叶尔羌系易名为叶尔羌群,并将涵义限制于这套地层上部的侏罗纪含煤地层.其下部原归上三叠统的部分因发现晚二叠世动、植物化石,遂改属上二叠统,后被另名为杜瓦组(新疆石油管理局编表组,1977).因此,本区在相当长一段时间内被认为缺失三叠系.1988年,刘淑文研究了李永安等在皮山县杜瓦地区采得的一批叶肢介化石,再次认为三叠系在这一地区存在,侯静鹏研究了该地区的晚二叠世孢粉.但这一地区二叠系和三叠系的接触关系以及杜瓦组的确切时代一直是悬而未决的难题.本文依据对皮山杜瓦地区杜瓦组19块样品分析出的孢粉所进行的研究,首次发现了该区早三叠世最早期地层的存在,论证了二叠系/三叠系界线在该区为连续过渡.
A huge set of continental strata along Pishan and Wada in the southwestern Tarim Basin have long been debated about the division and timing of the strata, and the early years were called the Yeerqiang system. Based on the fossil plants they produced, Was placed in the Upper Permian to the middle and lower Jurassic.In 1962, Sri Lanka Jiankang et al renamed the Yeerqiang system as the Yerqiang Group and limited its meaning to the Jurassic coal-bearing strata in the upper part of this formation The Lower Triassic part of the Lower Triassic was renamed the Upper Permian because of Late Permian fauna and plant fossils, and later renamed the Dewar Formation (Xinjiang Petroleum Administration Table Formulation Group, 1977). As a result, the area was considered missing for a long period of time in the Triassic system.In 1988, Liu Shuwen studied a group of leaf-like fossils such as Li Yongan and others in the Dehua area of Pishan County, Hou Jingpeng studied the Late Permian sporo-pollen in the area, but the contact relationship between Permian and Triassic in this area and the exact era of Dewar are always unresolved problems.In this paper, The first study of the pollen that was analyzed from 19 samples of the Dehua Formation in the Wa area was first found The presence of the earliest formation of Triassic demonstrates the Permian / Triassic boundary in the area of continuous transition.