Definition and global correlation of the Santonian‐Campanian boundary
Definition and global correlation of the Santonian‐Campanian boundary
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桑托尼亚-坎帕尼亚边界的定义和全球相关性
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
J. McArthur
中科院分区：
文献类型：
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作者：
A. Gale;P. Montgomery;W. Kennedy;J. Hancock;J. Burnett;J. McArthur
对不同地区生物地层学证据的回顾表明，不同海洋化石群的工作者用来定义Santonian-Campanian边界的标准在相对年龄和位置上有很大差异。这些标准中最广为人知的可能是独特的海百合类Marsupites testudinarius（北美、欧洲、亚洲、北非、澳大利亚）的灭绝，这与两种不同的边界定义--菊石Placenticeras bidorsatum和箭石Gonioteuthis granulataquadrata的出现--完全一致，也可能与南极有孔虫Globotruncana elevata的第三次进入一致。在广泛分离的地区的上Santonian和下Campanian继承的证据的比较，使我们能够把一系列重要的生物地层标志物在正确的顺序。定义了M. testudinarius对应的~（87）Sr/~（86）Sr为0.707479，δ ~（13）C有小的正偏移。磁时线33 R的底部，通常被认为与坎帕尼亚阶的底部一致，或正好落在坎帕尼亚阶的底部之上，被证明位于上Santonian Uintacrinus socialis带内。
Review of biostratigraphical evidence from different regions shows that criteria used by workers on various marine fossil groups to define the Santonian-Campanian boundary differ considerably in relative age and position. Probably the most widely recognizable of these criteria is the extinction of the distinctive crinoid Marsupites testudinarius (North America, Europe, Asia, north Africa, Australia), which, coincides exactly with two separate definitions of the boundary - appearances of the ammonite Placenticeras bidorsatum and the belemnite Gonioteuthis granulataquadrata - and may also coincide with a third - entry of the planktic foraminiferan Globotruncana elevata. A comparison of evidence from upper Santonian and lower Campanian successions in widely separated regions allows us to place a series of important biostratigraphical markers in correct order. Defining the boundary at the extinction of M. testudinarius corresponds to a 87Sr/86Sr of 0.707479, and a small positive excursion in δ13C. The base of magnetochron 33R, generally considered to coincide with, or fall just above the base of the Campanian, is shown to lie within the upper Santonian Uintacrinus socialis Zone.