Fossil liberation: a model to explain high biodiversity in the Triassic Cassian Formation
Fossil liberation: a model to explain high biodiversity in the Triassic Cassian Formation
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DOI：
10.1111/pala.12441
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发表时间：
2019-09
期刊：
影响因子：
2.6
通讯作者：
Vanessa Julie Roden;Imelda M. Hausmann;A. Nützel;Barbara Seuss;M. Reich;M. Urlichs;H. Hagdorn;W. Kiessling
中科院分区：
文献类型：
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作者：
Vanessa Julie Roden;Imelda M. Hausmann;A. Nützel;Barbara Seuss;M. Reich;M. Urlichs;H. Hagdorn;W. Kiessling
意大利南阿尔卑斯山白云岩中的三叠纪卡西安组拥有1429个动物物种，是科学界已知的任何空间受限的前第四纪地层中物种丰富程度最高的。较高的保存多样性部分归因于热带环境控制的较高的初级多样性，增加的阿尔法多样性，以及刺激贝塔多样性的生境范围。更重要的是，化石保存得很好，而且很容易从岩化程度较低的沉积物中提取。我们提出了‘解放拉格斯特滕’这个术语来捕捉这一保存窗口。与保守的拉格斯特顿不同，解放拉格斯特顿像卡西安组一样，起源于正常的海洋条件，但成岩作用级别较低。软体动物对物种丰富有很大贡献，占卡西安组所有无脊椎动物物种的67%。腹足类的优势(占所有物种的39%)几乎与最近的热带环境一样大，这与新生代大幅上升的概念相矛盾。
With 1429 animal species, the Triassic Cassian Formation in the Dolomites, Southern Alps (Italy), yields the highest species richness reported from any spatially constrained pre‐Quaternary formation known to science. The high preserved diversity is partly attributable to a high primary diversity governed by the tropical setting, increasing alpha diversity, and the breadth of habitats spurring beta diversity. More important is the excellent preservation of fossils and the ease with which they can be extracted from the poorly lithified sediments. We propose the term ‘liberation Lagerstätten’ to capture this preservational window. In contrast to conservation Lagerstätten, liberation Lagerstätten like the Cassian Formation originate from normal marine conditions but low‐grade diagenesis. Molluscs contribute substantially to species richness, comprising 67% of all invertebrate species in the Cassian Formation. The gastropod dominance (39% of all species) is nearly as great as in Recent tropical settings, contradicting the concept of a substantial Cenozoic rise.