The Worumba Anticline contains in its core a complex of intensely deformed and brecciated Callanna and Burra Group sediments and volcanics, surrounded by a less deformed rim sequence of unconformably overlying Umberatana Group sediments. The sedimentology, stratigraphy, depositional environments and biostratigraphy, particularly of stromatolites, of these core and rim sediments have been studied. The structural evolution of the anticline, and the nature of minor scattered occurrences of mineralization within the core complex, are also described.