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Historical Biology
An International Journal of Paleobiology
Volume 33, 2021 - Issue 8
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Articles

Campanian-early Eocene marine bivalves from the Kharga Oasis, Western Desert, Egypt; systematic palaeontology and palaeobiogeography

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Pages 1317-1347 | Received 13 Sep 2019, Accepted 12 Nov 2019, Published online: 03 Dec 2019
 

ABSTRACT

Thirty-six species of bivalves, belonging to 22 genera, representative of 16 orders, are systematically described from five upper Campanian-lower Eocene sections in the Kharga Oasis. Stratigraphically, 15 species were recorded from the Palaeocene, 8 from the lower Eocene, 8 from the Maastrichtian, 3 from the Campanian, 1 from the Campanian-Maastrichtian and 1 from the Maastrichtian-Palaeocene. The paleobiogeographic distribution of the Campanian-Maastrichtian bivalves reveals high degree of marine connection between the South Tethyan province and the West Africa, Middle East, southern Europe, South America and India provinces. Consequently, the Campanian-Maastrichtian bivalves have a strong southern Tethyan affinity. The early Palaeogene bivalves are markedly endemic to the Egyptian territory, which can argued to the isolation in marine environment by the localised tectonic events and/or the pronounced climatic changes. Accordingly, the palaeobiogeographic distribution of the studied bivalves was wider in the Late Cretaceous (Campanian-Maastrichtian) than in the early Palaeogene (Palaeocene-early Eocene).

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