...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Revised age estimates for the later Paleogene mammal faunas of Egypt and Oman
【24h】

Revised age estimates for the later Paleogene mammal faunas of Egypt and Oman

机译：修改后的埃及和阿曼古近代哺乳动物的年龄估计

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Jebel Qatrani Formation of northern Egypt has produced Afro-Arabia's primary record of Paleogene mammalian evolution, including the world's most complete remains of early anthropoid primates. Recent studies of Fayum mammals have assumed that the Jebel Qatrani Formation contains a significant Eocene component (approximate to 150 of 340 m), and that most taxa from that succession are between 35.4 and 33.3 million years old (Ma), i.e., latest Eocene to earliest Oligocene in age. Reanalysis of the chronological evidence shared by later Paleogene strata exposed in Egypt and Oman (Taqah and Thaytiniti areas, Dhofar Province) reveals that this hypothesis is no longer tenable. Revised correlation of the Fayum and Dhofar magnetostratigraphies indicates that (i) only the lowest 48 m of the Jebel Qatrani Formation are likely to be Eocene in age; (h) the youngest Fayum anthropoids, including well known species such as Aegyptopithecus zeuxis and Apidium phiomense, are probably between 30.2 and 29.5 Ma, approximate to 3-4 Ma younger than previously thought; (iii) oligopithecid anthropoids did not go extinct at the Eocene-Oligocene boundary but rather persisted for at least another 2.5 Ma; (iv) propliopithecid anthropoids first appear in the Fayum area at approximate to 31.5 Ma, long after the Eocene-Oligocene boundary; and (v) the youngest Fayum mammals may be only approximate to 1 Ma older than the 28- to 27-Ma mammals from Chilga, Ethiopia, and not 4-5 Ma older, as previously thought. Whatever gap exists in the Oligocene record of Afro-Arabian mammal evolution is now limited primarily to a poorly sampled 27- to 23-Ma window in the latest Oligocene.
机译：埃及北部的杰贝勒·卡特兰尼组已经形成了非洲-阿拉伯地区古近代哺乳动物进化的主要记录，包括世界上最完整的早期类人猿遗骸。对Fayum哺乳动物的最新研究假设，Jebel Qatrani组包含重要的始新世成分（大约340 m中的150个），并且该次继承中的大多数分类群存在于35.4至3330万年（Ma）之间，即最近的始新世至最早的渐新世。重新分析后来暴露于埃及和阿曼的古近纪地层共享的年代学证据（Dhofar省Taqah和Thaytiniti地区）表明，这一假设不再成立。修正的Fayum和Dhofar地层学相关性表明：（i）仅Jebel Qatrani组的最低48 m可能是始新世年龄； （h）最年轻的Fayum类人猿，包括众所周知的宙斯古猿（Aegyptopithecus zeuxis）和蚜虫（Apidium phiomense），大约在30.2至29.5 Ma之间，比以前认为的大约年轻3-4 Ma； （iii）少囊类人猿在始新世-渐新世边界并没有灭绝，而是至少持续了2.5 Ma。 （iv）在始新世-渐新世边界很久以后，先蝶类人猿首先出现在Fayum地区，大约31.5 Ma； （v）最年轻的Fayum哺乳动物可能比埃塞俄比亚奇尔加的28-27 Ma哺乳动物大约大1 Ma，而不是以前认为的4-5 Ma。渐新世记录的非洲-阿拉伯哺乳动物进化过程中存在的任何差距现在都主要限于在最新的渐新世中采样差的27至23 Ma窗口中。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号