Silicified Eocene Molluscs from the Lower Murchison District, Southern Carnarvon Basin, Western Australia
[<ecords o{ the Western A uslralian Museum 24: 217--246 (2008). Silicified Eocene molluscs from the Lower Murchison district, Southern Carnarvon Basin, Western Australia Thomas A. Darragh1 and George W. Kendrick2.3 I Department of Invertebrate Palaeontology, Museum Victoria, 1'.0. Box 666, Melbourne, Victoria 3001, Australia. Email: tdarragh(il.Illuseum.vic.gov.au :' Department of Earth and Planetary Sciences, Western Australian Museum, Locked Bag 49, Welshpool D.C., Western Australia 6986, Australia. 1 School of Earth and Ceographical Sciences, The University of Western Australia, 35 Stirling Highway, Crawlev, Western Australia 6009, Australia. Abstract - Silicified Middle to Late Eocene shallow water sandstones outcropping in the Lower Murchison District near Kalbarri township contain a silicified fossil fauna including foraminifera, sponges, bryozoans, solitary corals, brachiopods, echinoids and molluscs. The known molluscan fauna consists of 51 species, comprising 2 cephalopods, 14 bivalves, 1 scaphopod and 34 gastropods. Of these taxa three are newly described, Cerithium lvilya, Zeacolpus bartol1i, and Lyria lamellatoplicata. 25 of these molluscs are identical to or closely comparable with taxa from the southern Australian Eocene. The occurrence of this fauna extends the Southeast Australian Province during the Eocene from southwest Western Australia along the west coast north to at least 27° present day south latitude; consequently the province is here renamed the Southern Australian Province. Keywords: siliceous fossils, Eocene, Kalbarri, molluscs, new taxa, Carnarvon Basin, biogeography, Southern Australian Province. INTRODUCTION The source deposit, a pallid to ferruginous silicified Eocene marine molluscan assemblages from sandstone, forms a weakly defined, low breakaway coastal sedimentary basins in southern Australia trending N-S and sloping gently westward.
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