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

Abstract : 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
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Submitted on : Thursday, April 12, 2012 - 12:58:12 PM
Last modification on : Tuesday, February 18, 2020 - 3:46:02 PM

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

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