Early Carboniferous (Mississippian) ammonoid biogeography

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• 作者：Dieter Korn^a ; ^{dieter.korn@mfn-berlin.de} ; Alan L. Titus^b ; Volker Ebbighausen^c ; ¹ ; Royal H. Mapes^d ; Milan N. Sudar^e
• 关键词：Carboniferous ; Ammonoidea ; Biogeography ; Cluster analysis ; Non-metric multidimensional scaling
• 刊名：Geobios
• 出版年：2012
• 期刊代码：89_00166995
• 类别：ear
• 出版时间：January-February, 2012
• 卷：45
• 期：1
• 页码：67-77
• 文件大小：2137 K

摘要

Cluster analyses and non-metric multidimensional scaling of ammonoid assemblages from six successive Early Carboniferous time intervals (two Tournaisian, Vis茅an, and Serpukhovian) show that increasing provincialism is the main biogeographic trend through the period. While the assemblages from the Tournaisian to the early Late Vis茅an are globally similar in the tropical occurrences, dissimilarities appear in the middle Late Vis茅an and become pronounced in the latest Vis茅an, Pendleian, and Arnsbergian. From the latest Vis茅an, two major biogeographic realms are recognisable. A north-western realm consists of the four North Variscan regions (Rhenish Mountains, North England, South Portugal, and Moroccan Meseta) as well as the American Midcontinent and the Antler Foreland Basin. The second realm includes the South Urals, which is the most diverse region and thus has an isolated position, as well as the Jadar Block of Serbia, the Cantabrian Mountains of Spain, the Anti-Atlas of Morocco, and the Saoura Valley of Algeria.