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TAPHONOMY OF THE EARLY CAMBRIAN THE EMU BAY SHALE, A LAGERSTÄTTE, KANGAROO ISLAND, SOUTH AUSTRALIA

CHRISTOPHER NEDIN

Department of Geology and Geophysics, University of Adelaide, South Australia 5005

Nedin, C., 1995. The Emu Bay Shale, a Lower Cambrian fossil Lagerstätte, Kangaroo Island, South Australia. Memoirs of the Association of Australasian Palaeontologists, 18, 31-40.

ABSTRACT

The Emu Bay Shale on the northern coast of Kangaroo Island contains an exceptionally preserved fossil biota at Big Gully. Anomalocaris briggsi sp. nov. and Anomalocaris sp., found at the locality, represent the first Southern Hemisphere record of the genus and A. briggsi appears to have occupied a different ecological niche to that previously ascribed to the genus. Finds of juvenile Hsuaspis bilobata allow its ontogeny to be studied for the first time. Geochemical studies indicate that the Emu Bay Shale at big Gully was rapidly deposited under suboxic conditions. Precipitation of calcite under sulphate reducing conditions resulted in exceptional preservation.