2009年 第47卷 第3期: 208~233
作者:吴文裕,孟津,叶捷,倪喜军,毕顺东,魏涌澎 摘要:顶山盐池组是在新疆准噶尔盆地北缘乌伦古河流域新建立的一个新近纪岩石地层单位(孟津等,2008)。2006年本文作者在该组地层中采集了以小哺乳动物为主的哺乳动物化石。这里记述的化石采自位于同一陡坎的相距约1.6 km的两个剖面上的3个化石点,分属两个层位。化石点XJ 200613(46°24.572′N; 87°28.541′E)和XJ 200617(46°24.479′N; 87°29.818′E)都位于顶山盐池组的底部层位:前者位于该组底界2.3 m之上,后者则位于该组底部砂岩透镜体中。除少数大哺乳动物外,从这两个地点采集到的化石都是由筛洗法获得的小哺乳动物。另一个化石层位位于剖面的上部,在建组剖面中位于距底界34.5 m、距顶界12.4 m处,在该层位的化石点XJ 200614(46°24.757′N; 87°28.476′E)采集到一些大哺乳动物的牙齿碎片。这里将底部和上部层位的化石分开描述。 文内的测量数据,若无特殊说明,均为:齿冠长度´宽度;单位为毫米(mm)。
关键词:准噶尔盆地北缘,中新世,顶山盐池组,哺乳动物 卷期:47卷03期
The Miocene mammals from Dingshanyanchi Formation of North Junggar Basin, Xinjiang WU Wen-Yu, MENG Jin, YE Jie, NI Xi-Jun, BI Shun-Dong, WEI Yong-Peng
Abstract Fossil mammals from two levels of the Dinshanyanchi Formation are described. The fauna from basal beds of the formation consists of 22 small and 4 large mammal species belonging to 16 families of 7 mammalian orders, inclusive of a new speciesCricetodonvolkeri. The basal Dinshanyanchi fuana is correlative to the Moergen fauna of Nei Mongol, Quantougou fauna of Gansu, assemblages from the Chetougou and Xianshuihe formations of Xining Basin, and is middle Tunggurian in age, i.e. middle Middle Miocene, roughly equivalent to the early period of the European land mammal age MN7+8. A fragmentary cheek tooth of a probableHipparion(Plesiohipparion)houfenenseis the only identifiable specimen from the upper level of the Dingshanyanchi Fm., indicating an age of late Late Miocene or Pliocene of the sediments. However, a preliminary identification of the small mammals collected from the top level of the Dingshanyanchi Formation in the 2008 field season precludes from an age of Pliocene of the sediments. The Dingshanyanchi Formation spans therefore a time periord from middle Middle Miocene to late Late Miocene. Key words North Junggar Basin, Miocene, Dingshanyanchi Fm., mammals |