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  • Multibeam bathymetry gridded at 20m resolution and projected to WGS84 UTM zone 50S from the North Perth Survey (GA reference GA-0332).

  • Geological reconnaisance on the Macdonald and Rawlinson sheet areas has shown an aggregate thickness of 27,000 feet of Precambrian sedimentary rocks. These rocks have been divided into Lower and Upper Proterozoic but only on the north-east corner of the Macdonald sheet is the unconformity between the two sequences visible. Possible Archaean gneiss and quartzite have also been differentiated in the north-east Macdonald area, These rocks are similar to those in the Arunta Complex of the Alice Springs area. No relationship is visible between these rocks and those mapped as Lower Proterozoic.

  • Product Specifications Coverage: Partial coverage, predominantly in northern Australia, along major transport routes, and other selected areas. About 1000 maps have been published to date. Currency: Ranges from 1968 to 2006. Coordinates: Geographical and UTM. Datum: AGD66, new edition WGS84; AHD. Projection: Universal Transverse Mercator UTM. Medium: Paper, flat copies only.

  • At this scale 1cm on the map represents 1km on the ground. Each map covers a minimum area of 0.5 degrees longitude by 0.5 degrees latitude or about 54 kilometres by 54 kilometres. The contour interval is 20 metres. Many maps are supplemented by hill shading. These maps contain natural and constructed features including road and rail infrastructure, vegetation, hydrography, contours, localities and some administrative boundaries. Product Specifications Coverage: Australia is covered by more than 3000 x 1:100 000 scale maps, of which 1600 have been published as printed maps. Unpublished maps are available as compilations. Currency: Ranges from 1961 to 2009. Average 1997. Coordinates: Geographical and either AMG or MGA coordinates. Datum: AGD66, GDA94; AHD Projection: Universal Transverse Mercator UTM. Medium: Printed maps: Paper, flat and folded copies. Compilations: Paper or film, flat copies only.

  • Linespacing for the survey is 400 metres

  • During 1969, the Mundaring Geophysical Observatory collected seismic refraction data from explosions used by the Bureau of Mineral Resources No. 2 seismic party in the southwest of Western Australia. The seismic party exploded 37 charges up to 4,500 kilograms on a traverse from Balladonia through Kalgoorlie to Perth. Two mobile Willmore seismographs and permanent seismographs at Mundaring and Kalgoorlie recorded the resultant seismic waves. Raw data for this survey are available on request from clientservices@ga.gov.au - Quote eCat# 76503