This atlas brings together the latest geological ideas, incorporating earlier data gathered in the South Australian part of the basin, in an accessible form. The atlas consists of 30 plates covering a range of topics from topography and surface geology to water resources andpotential field data as well as the architecture of the basin fill. The atlas has been arranged to present some of the more general features of the basin such as topography, geology, structure and water resources in the earlier plates whilst concentrating on details of the basin fill in the later plates.

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A consortium consisting of the Bureau of Mineral Resources, Geology &Geophysics (BMR) (now called the Australian Geological Survey Organisation (AGS0)),Department of Primary Industries & Energy, Australian Government; the Department ofMineral Resources (DMR) (formerly the Department of Minerals and Energy), NSW StateGovernment; CRA Exploration Pty. Ltd.; Geopeko Pty. Ltd.; Pasminco Pty. Ltd.;conducted the Cobar Basin Seismic Survey during October to December 1989. The main objectives of the Cobar Basin seismic survey were to acquire deep reflection seismic data along several seismic lines across the Cobar Basin and thebounding west and east margins, and acquire high resolution seismic data across zones of known mineralisation in the Cobar Basin and bounding margins. The BMR Sercel SN368seismic data acquisition system was used to record the deep reflection seismic data, and the DMR Sercel 338 seismic data acquisition system was used to record the high resolution seismic data. The acquisition of the seismic data would be used to test newtectonic models recently developed for the evolution of the region, and for genesis and control of mineralisation, especially in rock units of the Cobar Basin around Cobar. On aregional scale the acquisition of seismic data would be used to test models of basin formation in the Cobar region which perhaps could be applied elsewhere in the LachlanFold Belt. The seismic reflection survey by the BMR, recorded 184 km of 8-fold CMP deepreflection seismic data to 20 seconds two-way travel time, along three seismic lines. The lines were positioned to investigate major structures defined by surface geology andpostulated in the recently proposed tectonic models. To provide seismic reflection data of the near surface geological rock units, 2.85 km of high resolution seismic data wererecorded along Line 2 by DMR, across a geological setting associated with mineralisation structures.

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This Record describes a seismic refraction survey at Callide Creek 49.8-mile dam site, near Biloela, Queensland. The survey was made at the request of the Queensland Irrigation and Water Supply Commission. Depths to unweathered bedrock and other rocks were determined by their seismic velocities and are shown on cross-sections. From general geological information and the results of drilling in the area, the seismic velocities can be translated into geological terms. Comparison with drilling results suggests that seismic depth estimates are about 18 per cent too low. After correcting this systematic error, the depth determinations are accurate to within 10 ft. Young's modulus for the unweathered bedrock, determined by the seismic method, is estimated at about 7 to 9 x 10,000,000 lb/in2.