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1995年以来作者等人在新疆准噶尔盆地北缘乌伦古河地区开展了第三纪哺乳动物地层研究工作。在调查研究该区乌伦古河组地层同时 (叶捷等 ,2 0 0 1a ,b) ,为搞清乌伦古河组的区域分布 ,我们在 1 999年和 2 0 0 1年先后两次前往布尔津地区考察了那里的“乌伦古河组”。在布尔津县城西北 1 4km处额尔齐斯河北岸的一片新生代露头 ,长期被视为乌伦古河组 ,因而时代也被定为始新世至渐新世 ,但一直没有确凿的化石依据。 1 999年我们首次在该套地层中采集到哺乳动物化石 ( 990 2 7地点 ) ,2 0 0 1年再次在同一地点、同一层位采集到化石并实测了地层剖面。布尔津的该乌伦古河组地层可大致分为两段 ,下段为富含铁质的砂岩与泥岩互层 ,上段为浅灰绿色砂岩与杂色泥岩互层 ,整套地层的风化表面呈黄棕色。在乌伦古河组建组的乌伦古河流域 ,乌伦古河组则由一套浅灰绿色砂岩与棕灰色含砂泥岩构成 ,整套地层风化表面呈灰白色 (叶捷等 ,2 0 0 1a)。两个地区的乌伦古河组的岩性显然是不同的。野外追索证明 ,这两个地区的两套不同岩性的地层是两个不同沉积盆地的堆积物 ,这两个盆地在乌伦古湖附近 (E87°1 2′)被一由古生代地层构成的山岭隔开。作为地质体 ,这两套地层间没有联系 ,不应当归为同一岩石地层单位。因此 ,布尔津
Since 1995, the authors carried out research on the tertiary mammalian stratigraphy in the Wulungu River area on the northern margin of the Junggar Basin in Xinjiang. While investigating and studying the strata of the Wulunguhe Formation in this area (Ye Jie et al., 2010a, b), in order to clarify the regional distribution of the Wulungu River Formation, we traveled twice in succession in 1999 and 2001 Burqin area inspected the “Ulungu River group.” A Cenozoic outcrop on the northern bank of the Irtysh, 14 km northwest of Burqin County, has long been regarded as the Ulungur Formation and was also dated from Eocene to Oligocene, but no definite fossil basis has been established . In 1999, for the first time, we collected mammalian fossils in this set of formations (990 2 7 sites). In 2001, we once again collected fossils from the same site and in the same layer and measured the formation profile. The Ulungur river formation in Burqin can be roughly divided into two sections. The lower section is an iron-rich interbedded sandstone and mudstone. The upper section is an interbedded layer of light grayish green sandstone and variegated mudstone. The weathered surface of the entire formation is yellowish brown . In the Wulungu River basin formed by the Wulungu River, the Wulungu River Formation consists of a series of light gray-green sandstone and brown-gray sandy mudstone, and the weathering surface of the entire formation is gray-white (Yejie et al., 2000a). The lithology of the Wulunguhe Formation in the two areas is apparently different. The field recourse demonstrated that two sets of lithologically different lithostratigraphic formations in these two areas are the deposits of two different sedimentary basins formed by a Paleozoic formation near Lake Erulu (E87 ° 12 ’) The mountains are separated. As a geological body, there is no connection between the two sets of strata and should not be grouped into the same unit of rock formation. Therefore, Burqin