Geology and mineraization in the western Lachlan Fold Belt: Geology and mineralization between West Wyalong and Condobolin, New South Wales

Abstract

Investigation of a belt of sedimentary rocks about 25 km wide and 75 km long which are generalized on the 1972 edition of the Forbes 1:250,000 geological sheet has indicated a stratigraphic succession at least 25,000 m thick probably of Silurian and Lower Devonian age. The basal conglomerate (Manna Conglomerate) overlies Ordovician andesitic volcanics which do not outcrop, but can be inferred from aeromagnetic maps to be present, and which are probably continuous under the Tullamore syncline with the Goonumbla Volcanics at Forbes and Parkes.