| mhorn | Дата: Wednesday, 31.08.2011, 13:09 | Сообщение # 1 |
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| Énay R. (2011) Ammonites jurassiques (Toarcien, Bajocien) de l’Oman central (Haushi-Huqf) et des exotiques des montagnes du nord de l’Oman : implications pour la paléoécologie et la paléobiogéographie // Revue de Paléobiologie. Vol.30. no.1. P.133-163.
Pdf http://www.ville-ge.ch/mhng/paleo/paleo-pdf/30-1/pal_30_1_07.pdf
New and rare Jurassic ammonites have been found in Oman ; on the one hand, in the Autochtonous of the Haushi Huqf massive in Central Oman, one uppermost Late Bajocian species from Arabian platform; on the other hand, in the Kawr/Misfah exotic unit of the Hawasina nappes in the mountains of Northern Oman, MiddleLate and Early Bajocian forms from Mediterranean Tethys and NW Europe. Beyond the dating allowed by these new faunas and the results based on the interpretation of the geological history of these parts of Oman, the paper develops the palaeoecological and palaeobiogeographical aspects. First, side by side occurrences in Oman of Arabian ammonites from very shallow platform environments and others from open-sea environments in the Mediterranean Tethys and NW Europe show that endemism of the Arabian “Province” resulted from ecological isolation while open environments on the Oman margin, especially the pelagic sea-mounts off the margin, are parts of a migration route between Western and Eastern Tethys (or Indo-SW Pacific), perhaps also beyond the latter. Then, the occurrences among the tethyan and pandemic components of the ammonite faunas in Northern and Southern American Pacific ranges of most of the taxa of open environments known on the Oman margin put back the “old” problem of the Pacific biogeography during Early Jurassic at the time before the genuine oceanic opening of the hispanic corridor would be achieved. Among the proposed models, the “pantropic distribution” model of Newton is especially examined in the light of the Cretaceous palaeobiogeography, particularly the data concerning rudists known on the atolls and sea-mounts in the present Pacific.
Middle Jurassic - Lower Cretaceous ammonites & aptychi
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