Legacy product - no abstract available

Legacy product - no abstract available

The period 17th June to 3rd July, 1953, was spent by the writer on the uranium fields. During this time an inspection was made of all work being carried out by the Bureau; in addition, the investigations by Territory Enterprise Limited at Rum Jungle were shown to the writer by W. Thomas, Resident Geologist.

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

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

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

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

Legacy product - no abstract available

The investigation of the Fitzroy Basin and adjacent areas was commenced in 1948 when a detailed survey was made of the Nerrima Structure and a widespread reconnaissance by land, sea and air was completed. The Fitzroy Basin survey was completed in 1952 and during this period 24 months were spent in the field and the remainder in office preparation. Approximately 40,000 square miles were examined during the survey and detailed maps covering an area of 28,000 square miles have been prepared at 1 inch = 1 miles, 1 inch = 2 miles and 1 inch = 10 miles. The area has been examined in the past in varying detail by three geological parties on behalf of local and overseas oil companies. The purpose of this survey was to examine the complete sedimentary sequence in sufficient detail to solve the problems encountered by previous surveys and eventually to be in a position to assess to a reliable degree the petroleum prospects of the area based on the examination of surface outcrop. The assessment of the petroleum prospects of the area has very definite limitations in that the potential source rocks (Devonian and Ordovician) are limited to the extreme eastern margin of the basin and nothing is known about their distribution or facies elsewhere under the cover of Permian and Mesozoic sediments. The aerial photography of the area, which was conducted by the Survey Squadron of the Royal Australian Air Force, has been the basis of all mapping, as reliable topographic maps of the area were not available.

Early in 1949, an extensive gravity survey was carried out between Sale and Orbost by R.H. Ray Co., U.S.A. for Lakes Oil Ltd. (Ray, 1949). The results of this survey were assessed by Professors Hills (1950) and Rudd (1950), Geological Consultants to Lakes Oil Ltd. As a result of their recommendations, supported by the Victorian Geological Survey, the Bureau of Mineral Resources was requested to carry out further geophysical work in the area. The work carried out by the Bureau includes gravity, seismic, and aeromagnetic surveys. In this record it is proposed to discuss the interpretation of the gravity results. As the Bureau's gravity work is complementary to the Ray Co. survey, the results of both surveys have been combined. The gravity work carried out by the Bureau was intended to provide more detail in some areas not fully covered by the Ray Co. survey, and to extend the margins of the survey on to the basement at the north, and along the coast on the south-east side. Most of the Bureau's work was in areas of difficult access, in swampy or sandy country. The following areas were covered. (1)The coastal area, between Lake Reeve and the sea. (2) Along the shore of Lake Wellington and adjacent areas. (3) To the south-west of Lake Wellington, to define the end of the Baragwanath anticline more closely. (4) In several areas west of Bairnsdale and north of Holland's Landing, to provide more detail on anomalies revealed by the Ray Co. survey. (5) To provide more detail on an anomaly near Giffard in the south-western part of the area. (6) Along several traverses northwards into the highlands.