Late Neoproterozoic stromatolites in glacigenic successions of the Kimberley region, Western Australia: Evidence for a younger Marinoan glaciation

Tungussia julia, a Neoproterozoic III stromatolite, occurs in the Egan Formation (Louisa Downs Group), the uppermost glacigenic unit in the Kimberley region of Western Australia. Identification of this stromatolite is significant because it allows biostratigraphic correlation of the Egan Formation with the Julie Formation of the Amadeus Basin (Supersequence 3 of the Centralian Superbasin) and the upper Wonoka Formation of the Adelaide Geosyncline. Both the Julie and Wonoka Formations are stratigraphically younger than the Marinoan glacial sediments of the Adelaide Geosyncline and Centralian Superbasin. This implies that the Egan Formation records a younger glaciation in the late Neoproterozoic in Australia. (C) 1998 Geological Survey of Western Australia. Published by Elsevier Science B.V.