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This report is a preliminary description of geophysical work undertaken by officers of the Geophysical Section at the request of the Zinc Corporation Ltd., in connection with the search for structures in the Frome Embayment which may contain natural gas and oil. The object of the survey, methods, results, and interpretation of the results are discussed in this report. Accompanying plans are included.

The gravity survey covered by this report was undertaken at the request of the South Australian Department of Mines as part of the investigation of a proposed reservoir site ay Myponga, South Australia. Myponga is about 40 miles south of Adelaide and the proposed reservoir would serve Yankalilla and other neighbouring towns which at present have no reticulated water supply. The geology of the area, method and operations, results of the survey, and interpretations are discussed in this report. Two plans, one of the gravity survey, and one showing surface and gravity profiles, are included in this report.

This report describes the results of an examination of six samples taken from a cutting approximately 40 miles north of Injune.

This report describes the fossils collected by D.M. Traves early in 1948 from the Barkly Tableland and adjacent areas in Queensland and the Northern Territory. The sequence of Cambrian faunas as far as it can be recognised in the present collection corresponds to the revised sequence given by F.W. Whitehouse in "The Cambrian Faunas of North-East Australia". This report comprises stratigraphical and palaeontological notes, and a preliminary list of fossils with notes on the lithology of the rocks in which they occur.

Samples of "glauconite" were collected from the glauconitic sandstone at Lakes Entrance and the glauconitic fossiliferous Miocene limestone of Maslin's Beach and Hackham. The refractive indices of the samples were measured. The results were compared against the range of refractive indices for glauconite, as given by A.N. Winchell. The composition of the samples and the observed results are discussed in this report.

The Pilbara gold field area contains many other minerals besides gold. It has long been known that the radio-active minerals, including monazite and certain rare-earth tentalates, occur in portions of the Pilbara field. There is also one known highly radio-active deposit of pilbarite at Wodgina. A survey to determine the position and extent of radio-active occurrences in the Pilbara area was carried out in 1947. In the report on this survey a number of recommendations was made, and subsequently a further field party was sent to the area during the period September - October, 1948. This report is an account of the geophysical work done by this second party. Investigations were carried out at Mount Francisco, Wodgina, Eastern Creek, Pilgangoora, Abydos, Trig Hill, Cooglegong, and Eley's Well. The main part of the work consisted of testing known or suspected rare-earth tantalate deposits. Also, a further search was made for monazite in areas on and near the Cooglegong tin fields. The technical procedure and results of the survey work are discussed in this report.

The area under review in this report comprises a large territory located in south-western Victoria and south-eastern South Australia. The scope of direct geological information in the areas underlain by marine Tertiary rocks is severely limited, by very poor exposure of the underlying rocks at the surface. Under such conditions, once the scattered exposures have been examined and recorded on the map, little more can be done by surface work; the geologist is thrown back on a study of well and bore records and of the results of geophysical measurements. Considerable literature has been read and records of the principal bores in the area have been examined in detail. It has been recommended that a geophysical survey of the area be conducted, to determine, if possible, any structural features which might exist at depth in this southern-most extension of the Murray River Artesian Basin, which is made up of Tertiary to Recent formations, resting, in the area under review, on a basement of Pre-Cambrian or Jurassic Rocks. This report comprises an overview of the general geology, geological history, stratigraphy and topography of the area under consideration. Geological, bore-hole and well data has been compiled and tabulated. A geological sketch map is included.

In 1943, an investigation was carried out on portions of the Latrobe Valley Brown Coalfield, using the electrical resistivity method, to see whether or not this method could prove useful in determining the depth to coal. At this time, the possibility of a gravity survey was discussed, and in January, 1948, gravity tests were commenced using a Humble-Truman gravimeter. Later, a substantial number of the readings were repeated with a more modern type of gravity meter, and a few new stations established. The results were subjected to a preliminary investigation soon after the completion of field work, but it was evident that a much more detailed study would be required before an interpretation could be completed. Prior to these tests, discussions took place between technical officers with a view to selecting an area for testing on which the results could be related to some of the known geological structures, and, subsequently, an area was selected in the Parish of Hazelwood for this purpose. The geology of the area, survey method, and results are discussed in this report. Accompanying geological plans are included.

Bores sunk at Cremorne in 1891 struck coal at approximately 2802 feet. A company was formed to work the coal, but was refused permission to operate at Cremorne. A site at Balmain was secured, and the Birthday Shaft was sunk to a depth of 2,937 feet between 1897 and 1902. This report provides an overview of the occurrence of natural gas and workings for the period 1897 to 1948. Gas yields, commercial production, leakage problems, and the use of testing to determine the behaviour of gas in the mine are the key subjects that are addressed in this report.