File:Opalized Cyrenopsis fossil bivalves (Bulldog Shale, Lower Cretaceous; Coober Pedy Opal Field, South Australia) (15024694808).jpg
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[edit]DescriptionOpalized Cyrenopsis fossil bivalves (Bulldog Shale, Lower Cretaceous; Coober Pedy Opal Field, South Australia) (15024694808).jpg |
Opalized molluscs from the Coober Pedy Opal Field (Bulldog Shale, Aptian Stage, upper Lower Cretaceous) of South Australia. This is a concentration of opalized clam shells in a tempestite (storm bed). This is a multispecies assemblage principally consisting of Cyrenopsis australiensis and Cyrenopsis meeki. A few opalized mussel shells (Eyrena tatei) and opalized snail shells (Euspira) are mixed in as well. (public display, SAM P31847, South Australian Museum, Adelaide, Australia) The Coober Pedy area of southern Australia is world-famous for its high-quality precious opal (= hydrous silica - SiO2·nH2O). Some of the opal at Coober Pedy (pronounced “koober peedee”) has replaced fossil skeletal material. Most of the opalized fossils here are various marine bivalve (clam) species, but Coober Pedy opal replaces other fossil remains as well (for example, snails, belemnites, crinoids, ichthyosaurs, and plesiosaurs). Even soft parts have been preserved & replaced by opal (Kear, 2006). The specimens shown here are unpolished fossil clams assignable to Cyrenopsis (either C. australiensis or C. meeki) (Animalia, Mollusca, Bivalvia, Heterodonta, Veneroida, Arcticaceae, Neomiodontidae). Locality: unrecorded mine field in Coober Pedy Opal Field, north-central South Australia State, southern Australia. Stratigraphy: “weathered zone” of the Bulldog Shale, lower Marree Subgroup, Aptian Stage, upper Lower Cretaceous. Reference cited: Kear, B.P. 2006. Marine reptiles from the Lower Cretaceous of South Australia: elements of a high-latitude cold-water assemblage. Palaeontology 49: 837-856. |
Date | |
Source | Opalized Cyrenopsis fossil bivalves (Bulldog Shale, Lower Cretaceous; Coober Pedy Opal Field, South Australia) |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15024694808. It was reviewed on 6 May 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
6 May 2015
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File change date and time | 18:03, 11 September 2014 |
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Date and time of digitizing | 23:52, 16 August 2006 |
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Date metadata was last modified | 14:03, 11 September 2014 |