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Biogeographic analysis of Jurassic-Early Cretaceous wood assemblages from Gondwana |
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| Authors: | M Philippe M Bamford |
| Institution: | a Laboratoire de Paléobotanique, Université Lyon-1 and UMR 5125 of the CNRS, 7 rue Dubois, F-69622 Villeurbanne cedex, France b Bernard Price Institute for Palaeontological Research, School of Geosciences, University of Witwatersrand, South Africa c School of Natural Resource Sciences, Queensland University of Technology, Australia d Departamento de Estratigrafia e Paleontologia, Universidade do Estado do Rio de Janeiro, Brazil e Department of Earth Sciences, University of Bristol, UK f Centro de Ecologia Aplicada-CONICET and Faculdad de Ciencias Exactas y Agrimensura, Universidad Nacional del Nordeste, Argentina g Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina h Department of Botany, University of Queensland, Australia i Birbal Sahni Institute of Palaeobotany, India j Biology Department, Towson University, Maryland, MD, USA k Laboratorio de Paleobotánica, Faculdad de Ciencias Agronómicas, Universidad de Chile, Chile l Departamento de Paleobotánica, Faculdad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Argentina |
| Abstract: | The terrestrial biogeography of Gondwana during Jurassic-Early Cretaceous times is poorly resolved, and the flora is usually considered to have been rather uniform. This is surprising given the size of Gondwana, which extended from the equator to the South Pole. Documenting Gondwanan terrestrial floristic provincialism in the Jurassic-Early Cretaceous times is important because it provides a historical biogeographic context in which to understand the tremendous evolutionary radiations that occurred during the mid-Cretaceous. In this paper, the distribution of Jurassic-Early Cretaceous fossil wood is analysed at generic level across the entire supercontinent. Specifically, wood assemblages are analyzed in terms of five climatic zones (summer wet, desert, winter wet, warm temperate, cool temperate) established on the basis of independent data. Results demonstrate that araucarian-like conifer wood was a dominant, cosmopolitan element, whereas other taxa showed a greater degree of provincialism. Indeed, several narrowly endemic morphogenera are recognizable from the data. Finally, comparisons with Laurasian wood assemblages indicate strong parallelism between the vegetation of both hemispheres. |
| Keywords: | Gondwana Fossil wood Jurassic Early Cretaceous Continental ecosystems Floristic provincialism |
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