Department of Geology • University of Queensland VOLUME 10 NUMBER 2 Summary of Formations and Faunas of the Permian Back Creek
Department of Geology • University of Queensland VOLUME 10 NUMBER 2 Summary of formations and faunas of the Permian Back Creek Group in the Southeast Bowen Basin, Queensland D.J.C. BRIGGS & J.B. WATERHOUSE Stratigraphy and palaeobotany of East and West Haldon, Main Range, Southeast Queensland M J. DUDGEON Date of publication: June 1982 SUMMARY OF FORMATIONS AND FAUNAS OF THE PERMIAN BACK CREEK GROUP IN THE SOUTHEAST BOWEN BASIN, QUEENSLAND by D.J.C. Briggs & J.B. Waterhouse (with 1 Text-figure) ABSTRACT. In the southeastern Bowen Basin the Back Creek Group is almost entirely marine and comprises, in ascending order, the Büffel, Pindari, Brae, Oxtrack, Barfield and Flat Top Formations. We informally divide the Büffel Formation according to lithology into three members, each having a different fauna, but all of early Permian age. We correlate the upper member with the lower Homevale fauna of the northern Bowen Basin. The upper Homevale fauna is absent in the type Büffel, but is seen in strata mapped as Büffel to the north. The Pindari Formation is poorly fossiliferous in the type section. A marine fauna unmatched elsewhere in eastern Australia characterizes the Brae Formation. The Oxtrack Formation has a distinctive small fauna known from New Zealand and New South Wales, but not yet recognized elsewhere in the Bowen Basin. The thick, fine-grained Barfield Formation matches through its lithology and fauna the lower or restricted Ingelara Formation of the southwestern Bowen Basin. The Flat Top Formation contains a basal fauna like that of the Barfield, two successive younger faunas which match those of the Peawaddy and lower Blenheim Formations of the southwestern and northern Bowen Basin, and small overlying faunas of uncertain age.
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