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Environmental controls on the distribution of neoselachian sharks and rays within the British Bathonian (Middle Jurassic).

Underwood, Charlie J. (2004) Environmental controls on the distribution of neoselachian sharks and rays within the British Bathonian (Middle Jurassic). Palaeogeography, Palaeoclimatology, Palaeoecology 203 , pp. 107-126. ISSN 0031-0182.

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Official URL: http://www.sciencedirect.com/science/journal/00310...

Abstract

Extensive sampling from a range of facies within the Bathonian (Middle Jurassic) of southern England has allowed the palaeoenvironmental distribution of a number of taxa of neoselachian sharks and rays to be assessed. Faunas were collected from a number of recurrent facies, with different assemblages being characteristic of particular palaeoenvironments. Palaeoenvironmental specificity occurred at both ordinal and specific level. Samples from offshore facies contain high diversity faunas containing members of all neoselachian groups known to have been present in the Middle Jurassic. Shallower water assemblages contain lower diversity faunas lacking Synechodontiformes and Hexanchiformes. Samples from lagoonal facies contain low diversity faunas typically comprising different species from open marine settings. The presence of different taxa within different palaeoenvironments suggests that by the Bathonian neoselachians had differentiated into a wide range of niches and ecologically more diverse than has previously been recognised. Implications for early neoselachian palaeoecology, salinity tolerance and diversification are discussed.

Item Type: Article
Keyword(s) / Subject(s): Bathonian, Neoselachii, sharks, rays, Jurassic, palaeoecology, palaeoenvironment.
School or Research Centre: Birkbeck Schools and Research Centres > School of Science > Earth and Planetary Sciences
Depositing User: Charlie Underwood
Date Deposited: 21 Mar 2005
Last Modified: 17 Apr 2013 12:32
URI: http://eprints.bbk.ac.uk/id/eprint/114

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