| 论国际奥陶—志留系的分界 |
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| 引用本文： | 穆恩之,戎嘉余.论国际奥陶—志留系的分界[J].地层学杂志,1983(2). |
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| 作者姓名： | 穆恩之 戎嘉余 |
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| 作者单位： | 国际地层委员会奥陶—志留系界线工作组选举委员
(穆恩之)，国际地层委员会奥陶—志留系界线工作组通讯委员(戎嘉余) |
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| 摘 要： | <正> 有关地质历史时期中各大时代(如代与纪)的界线问题已经成为地质研究领域里的重大课题。地层与古生物学者采用多种手段(如化石分带、绝对年龄数值和磁性反向等)来确定系级界线的精确位置。自从国际地层委员会所属志留—泥盆纪界线工作组首先于1972年向第23届国际地质大会提交确定志留—泥盆纪分界的报告以来,其它多数系间的界线工作组亦在不同程度上大致如同他们的做法,来解决各自的界线问题。其方法是:先择
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On the international Ordovician and Silurian boundary |
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| Abstract: | A review of the recent state of the Ordovician-Silurian boundary research indicates that the Boundary Working Group (OSBWG) has done much in this important work. The matter of principle in regard to the specific of the boundary is discussed and a viewpoint in which a leading fossil group for determining the boundary should be the graptolite is restated. Relative merits of two potential boundary stratotypes (Dob's Linn and Anticosti) are evaluated. It seems that no section which meets all requirements for an Ordovician-Silurian boundary stratotype has been known as yet. It is not appropriate to take a formal postal vote until we can be certain that all divergent views are fully understood by all the OSBWG members and the matter of principles has been adequately explored, because conditions are not ripe for settlement of the issue. |
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