Fragmenta Palaeontologica Hungarica

Author(s): Vörös, A. & Dulai, A.
Title: Jurassic brachipods of the Transdanubian Range (Hungary); stratigraphical distribution and diversity changes
Year: 2007
Volume: 24-25
Pages: 51-68.

Abstract: Several thousands brachiopod specimens have been collected from 7 different stages of the Jurassic in the Transdanubian Range (TR). The fauna shows a great diversification in the Hettangian to Pliensbachian interval, with a diversity peak reached in the late Sinemurian. This is consistent with the global recovery process after the end-Triassic extinction. The Early Toarcian disappearance of the brachiopods from the TR was apparently connected to the Tethyan anoxic event. The decreasing diversity andor absence of brachiopods in the Middle to Late Jurassic is explained by the limited food-supply at the deepening sea-floor, i. e. to the gradual subsidence of the territory of the TR. The minor Bajocian and Tithonian diversity peaks were related to phases of extensional tectonic movements providing hard substratum favourable for settlement of brachiopods. Possible cold seeps might contribute to the enrichment of brachiopods by supporting chemosynthetically based communities.
Keywords: Hungary, diversity, Jurassic, Brachiopoda, stradgraphical distribution

Journal: Fragmenta Palaeontologica Hungarica
Journal abbreviation: Fragm. Palaeont. Hung.
ISSN: 1586-930X
Publisher: Hungarian Natural History Museum, Budapest
Editor(s): Szabó, J. & Matskási, I.