Mesozoic stratigraphy in central western New South Wales

Abstract

Detailed stratigraphical investigations of Mesozoic sediments in the Dubbo-Binnaway-Wollar region have made it possible to correlate sedimentary rock units and sequences previously described under different names in separate areas. Triassic and Jurassic sediments have been divided into five formations with an interbedded section of volcanics. Two of the formations have been subdivided into members. Rock units have been traced and correlated throughout the region, and a uniform system of nomenclature is proposed. The stratigraphical position of the Triassic-Jurassic time boundary has been established, and an associated disconformity varying in extent of time break and of significance in depositional history is recorded throughout the region.