Stromatolites from Middle and Late Proterozoic Sequences in the Mcarthur and Georgina Basins and the Mount Isa Province, Australia

As part of a continuing biostratigraphic study, stromatolites are described and named from the following units: Amelia Dolomite, Tooganinie Formation and Emmerugga Dolomite (McArthur Group), and the Balbirini Dolomite (Nathan Group), McArthur Basin; Lochness Formation (Haslingden Group), Mount Isa Province; Yardida Tillite, Georgina Basin. The latter is Late Proterozoic and all others are Middle Proterozoic. To the previous record of Conophyton garganicum Korolyuk from the McArthur Basin we add Kussiella kussiensis Krylov, Omachtenia omachtensis Nuzhnov, Acaciella emmerugga f. nov. and the components of the Balbirina prima bioherm series, Bukalara tortuosa gr. et f. nov. and Australoconus abnera gr. et f. nov. We introduce a formal taxonomic procedure for bioherm series. ISegosia isa f. nov. is described from the Mount Isa Province and Yardida delicata gr. et f. nov. from the Georgina Basin. The new groups and forms at present are unknown from elsewhere and so have no biostratigraphic significance at this stage, but the assemblage of stromatolites from the McArthur Basin allows correlation with the Lower Riphean of the USSR, which is consistent with the available geochronologic constraints.