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Article Dans Une Revue Geological Magazine Année : 2010

Soft-part preservation in a bivalved arthropod from the Late Ordovician of Wales

Résumé

A new component of the Early Palaeozoic arthropod fauna is described from a monospecific accumulate of carapaces in a Late Ordovician (Katian) hemipelagic mudstone from the Cardigan district of southwest Wales (UK). Its non-biomineralized carapace is preserved as a carbonaceous residue, as is more labile anatomy (soft-parts) including the inner lamella and sub-ovate structures near its antero-dorsal margin, which we interpret to be putative eyes The depositional context and associated fauna indicate that the arthropods inhabited an area of deep water and high primary productivity above a pronounced submarine topography The preserved density of carapaces Suggests the arthropods may have congregated into shoals or been transported post-mortem into depressions which acted as detritus traps The accumulate provides a rare example of soft-part preservation in hemipelagic mudstones and highlights the role of organic material as a locus for authigenic mineralization during metamorphism

Dates et versions

insu-00687129 , version 1 (12-04-2012)

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Citer

A. Page, Philip R. Wilby, Mark Williams, Jean M.C. Vannier, Jeremy R. Davis, et al.. Soft-part preservation in a bivalved arthropod from the Late Ordovician of Wales. Geological Magazine, 2010, 147 (2), pp.242-252. ⟨10.1017/S0016756809990045⟩. ⟨insu-00687129⟩
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