The samples from Margaret Bay were collected by H.B. Owen during a recent visit to the northern coast of Australia. The collection was made with the hope that microfossils may be found in the rocks which were collected from a twenty foot section exposed at Margaret Bay. The results of the micropalaeontological examination are discussed herein.

The material described in this report was collected and forwarded for examination by Mr. M.R. Banks of the Geology Department, University of Tasmania. The report comprises notes on the lithology, fossil content, state of preservation, and correlation, of the samples.

This report deals with the work done by a field party of the Geophysical Section, Bureau of Resources, on leases in the Astrolabe Mineral Field held by Mandated Alluvials N.L. The work was done in the 1950 field season from March to December and was a continuation of the work done in 1949 and described in the first progress report. The geophysical survey was conducted using the magnetic, self-potential, equipotential-line, potential-drop-ratio, and electromagnetic methods. An overview of the geophysical methods used, their results, and the local geology, is provided for each of the individual areas surveyed in the course of this work.

A geophysical survey was made in the Rum Jungle district in October and November, 1950, using self-potential and potential-ratio methods. This investigation formed part of a larger programme of geological and geophysical exploration for uranium minerals. Self-potential surveys were made over three areas, namely, Brown's Copper Mine Area, Intermediate Area, and White's Area. A potential-ratio survey was made over only the first of these. This report gives an account of the geophysical work conducted in each of these areas. The results of the survey are described, and recommendations for future drilling work are given, for each of the surveyed areas respectively.

For the purpose of obtaining further information as to favourable structural features in relation to brown coal seams within the Yallourn-Morwell-Traralgon area, a gravity survey is being carried out by the Bureau of Mineral Resources, Geology and Geophysics at the request of the State Electricity Commission of Victoria. In the following a preliminary interpretation is given of the results obtained by this survey to date. This interpretation includes a detailed correlation of the gravitational disturbances with the geological structures so far known. Practical experience to be gathered from the work so far done has been outlined.

This map has been prepared to display the probable form of the Isogonic Lines in the regions surrounding Australia, the boundaries being the meridians 85°E and 180°, and the parallels of latitude 10°N and 60°S. This report contains explanatory notes to the isogonic map.

The Nunyerrie Asbestos Deposits are associated with a remnant of metamorphosed ultrabasic rocks in granite country, which is part of a group of Pre-Cambrian rocks of Archaean age. The ultrabasics form an east northeast trending ridge about 1 mile long and 250 feet average width, which rises to a maximum elevation of 300 feet above the general level of the surrounding country. The belt of ultrabasics is highly sheared and jointed and consists chiefly of serpentines, but talcose rocks, chlorite schists, authophyllite rock and what appear to be hydro-biotite schists also occur. The ultrabasics have an intrusive junction with the surrounding granite rocks, and they are intruded by quartz veins and granitic dykes. The deposits were investigated by the author. This report gives an overview of the deposits. Workings, production figures, reserves, grades, and prices are described.

No abstract available

The Desert Basin covers an area of approximately 140,000 square miles in the Kimberley and Eastern Divisions of Western Australia. Geological investigations have been almost entirely confined to the northern part of the area; the southern part is covered by parallel sand-dunes with a few scattered outcrops and is relatively unexplored. A programme of geological mapping was initiated in the area by the Commonwealth Government in 1948. The entire area is being mapped, using aerial photographs, stratigraphic studies are made and fossils are collected for correlation purposes. The aim of the investigation is the evaluation of the petroleum prospects of the area. During the period 1948 to 1950, mapping has been carried out in Dampier Land and the area north of the Mt. Fenton Fault. The information in this paper will refer mainly to the area already mapped with brief reference to the unexplored area to the south.

Legacy product - no abstract available