A latest Llandovery to latest Ludlow high-resolution biostratigraphy based on the Silurian of Gotland—a summary
A latest Llandovery to latest Ludlow high-resolution biostratigraphy based on the Silurian of Gotland—a summary
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基于哥特兰岛志留纪的最新 Llandovery 到最新 Ludlow 高分辨率生物地层学——摘要
DOI：
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发表时间：
2006
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通讯作者：
M. Calner
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作者：
L. Jeppsson;M. Eriksson;M. Calner
在瑞典哥特兰岛Landovery晚期至卢德洛晚期出露地层中，已识别出26个牙形石带和63个连续亚带及牙形石动物群。在波罗的海的其他地方以及其他古大陆上，已经确定了所有的地带，以及几个亚地带和动物群，这表明这种地带性很好地作为钙质演替的标准地带性。根据最新的辐射时间尺度，温洛克和卢德洛带的平均持续时间为396±208 ka。然而，大多数区和亚区形成的广泛认可的志留纪海洋事件对应的时间更少，每单位在30至100 ka的顺序，而大多数的那些形成在干预事件对应的几个100 ka。61个温洛克和卢德洛带、亚带和动物群的平均持续时间仅为156±82 ka，即，是现存中生代生物地层学分辨率最高的地区之一。在哥得兰岛，已知的地层最大厚度已增加到750米以上。
Abstract A succession of 26 conodont zones and 63 successive subzones and conodont faunas have been identified in the exposed latest Landovery to latest Ludlow strata of Gotland, Sweden. All zones, and several of the subzones and faunas, have been identified elsewhere on Baltica, as well as on other palaeocontinents, indicating that this zonation serves well as the standard zonation for calcareous successions. The average duration of the 24 Wenlock and Ludlow zones was 396±208 ka, using the latest radiometric timescale. However, most zones and subzones formed during the widely recognised Silurian oceanic events correspond to less time per unit—in the order of 30 to 100 ka—and most of those formed during intervening episodes correspond to a few 100 ka. The average duration of the 61 Wenlock and Ludlow zones, subzones, and faunas was only 156±82 ka, i.e., among the highest biostratigraphical resolution available for Phanerozoic epochs. On Gotland the combined known maximum thickness of the strata has increased to more than 750 m.