Legacy product - no abstract available

Legacy product - no abstract available

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Between February and May, 1957, an experimental seismic reflection survey was made in the Sydney Basin by the Bureau of Mineral Resources to test the applicability of the method in that area and to investigate the sedimentary section. The work done at four different locations is described and the seismic results obtained are discussed in relation to the known geology. In general, the seismic method proved applicable in the Sydney Basin. The use of multiple geophone and shot-hole techniques proved desirable in some areas, notably on the Hawkesbury Sandstone. The seismic work indicated the existence of sediments up to 15,000 feet thick. Insufficient seismic work was done to prove the existence of individual structures suitable for the accumulation of oil or gas.

The R502 series of maps has been replaced by the National Topographic Map Series (NTMS). The R502 series consists of 542 map sheets and covers Australia at a scale of 1:250,000. It was compiled from aerial photography, but only about one quarter of the series was contoured. The standard sheet size is 1 degree of latitude by 1.5 degrees of longitude. Transverse Mercator map projection and Clark 1858 datum were used. Coverage of the country was completed in 1968.

These documents have been scanned by the GA Library. Please refer to the document for contents.

No abstract available

Legacy product - no abstract available

This Bulletin is a summary of the geological history of the Canberra City District and serves as an explanation to the accompanying geological and tectonic maps. The original text was accidentally destroyed, together with all records except the maps here presented and one showing the locations of all studied outcrops (totalling 340); the collection of fossils, except for some graptolites, is still intact. The summary for the A.N.Z.A.A.S. Handbook (Opik, 1954) was compiled from the original text and served as a basis in rewriting the present Bulletin. Because of subsequent building operations, many of the destroyed records cannot be restored. The geological map requires some comment. The map is correct insofar as the visible sequence is concerned; where the sequence is obscured by faults it reflects the author's interpretation to satisfy all the circumstantial evidence - structural, lithological, and palaeontological - so far available. The accuracy of the boundaries is not absolute: small outcrops of weathered, or even fresh, rocks (for example, calcareous mudstones) do not provide all criteria for their formational classification and, in marginal cases, have had to be classified according to the boundary already inferred, and not vice versa; some portions of the boundary between the Turner Mudstone and the Riverside Formation are so treated.

Legacy product - no abstract available