塔里木盆地塔东2井奥陶系笔石化石层

THE ORDOVACIAN GRAPTOLITES FROM THE TADONG-2 BOREHOLE OF THE TARIM BASIN

塔里木盆地东部塔东 2井岩心中新发现了一些奥陶系笔石化石 ,这些笔石标本呈炭质薄膜状 ,保存在该井4 5 5 0 .2 m至 4 5 5 5 .3m的灰黑色泥岩之中。经研究 ,笔石动物群的时代属于玉山晚期至达瑞威尔早期 ,含笔石化石层顶部层位可与塔里木盆地东北缘却尔却克山剖面中奥陶统却尔却克组底部 Pseudamplexograptus

The Ordovician graptolite bearing beds have been found from the core of Tadong 2 borehole in the northeastern Tarim Basin, Xinjiang. The graptolites are preserved as carbonaceous film in grey black mudstone at depths of 4 550.2— 4 555.3m in this borehole. The age of the graptolite fauna is Darriwilian or Zhejiangian. The horizon of the graptolite bearing beds may be correlated with Pseudamplexograptus confertus Zone at the base of the Queerqueke Fm. on the northeastern margin of the Tarim Basin.