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  • Three samples of limestone were collected during a geological survey of the Rigo area. One sample is of Upper Cretaceous age and the others of Lower Middle Miocene age. The samples were submitted for micropalaeontological examination. The results of this examination are described here.

  • The purpose of the investigation was to determine the degree of uniformity of the earth's magnetic field over the existing and the alternate compass swinging sites for ground swinging of aircraft. Field work was carried out on 30/1/51 and 5/2/51. Instruments used were the Vertical Force Variometer and the Wingfield Compass. The report gives an account of the field work and the results of the survey.

  • A small collection of rock samples containing Gondwana type fossil plants from three localities near Collinsville is discussed in this report. All assemblages - although with some conspicuous differences - show the characteristic Permian Glossopteris Flora. On the determination of the representatives of this flora alone, however, it cannot be said to which particular horizon within the Permian Bowen Series the samples from Collinsville belong. Modern statistical methods are suggested.

  • A seismic survey was carried out near Roma during 1949-50, being part of a geophysical programme to search for structures likely to be significant for oil exploration. As preparation and publication of the final report on the survey may take some time it is desired to present briefly the main results in the form of a preliminary report. The first phase of the geophysical survey work at Roma comprised gravity and magnetic surveys, the results of which were presented in Bulletin No. 18. The residual gravity pattern revealed two possible structural high closures. The object of the seismic surveys was to prove or disprove the existence of these structures, and to obtain more detail concerning them if proved.

  • This report contains the results of brief geological investigations carried out in conjunction with the Land Research and Regional Survey Unit to provide information on land types and their distribution in the Burdekin River Valley. A geological map and sections at the horizontal scale of 4 miles to 1 inch have been compiled from air-photo interpretation controlled by widely spaced land traverses. An account of the stratigraphy is given, and palaeontological reports on the fossils collected appear as appendices.

  • The Government of India invited the Australian Government to send a representative to the celebration of the Centenary of the Geological Survey of India during January 1951. The first meeting of the Pan-Indian Ocean Science Congress was scheduled for the first week in January, 1951 so the Bureau of Mineral Resources, Geology and Geophysics selected M.A. Condon to attend the Science Congress and the Centenary Celebrations because his work in the North-West Basin of Western Australia would be of some interest to geologists working around the Indian Ocean. This report comprises a detailed itinerary and geological notes on the areas visited during the course of the visit.

  • 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.

  • This report covers the results of a seismic reflection traverse on a portion of the Giralia anticline which has been mapped in Mesozoic and Tertiary rocks in the North-West basin. The work constitutes a part of a general programme of investigation which the Bureau of Mineral Resources, Geology and Geophysics, has been carrying out on Permit areas held by Ampol Petroleum Ltd. in this area. The seismic traverse described herein lies along the main road joining Giralia and Bullara homesteads and crosses the northern end of the Giralia structure. Tests were made with shooting in shot holes and also by air shooting. In addition, a refraction spread was shot along the axis of the anticline. This report gives an account of this investigation. Technical matters, such as interpretation technique and the symbols used in plotting results, are briefly noted. The results of the study and subsequent conclusions are discussed.

  • The presence of native sulphur on the slopes of Mt. Suretamatai, Vanua Lava Island, Banks Group has been known since 1887 or earlier, and many claims, most of them extravagant, have been made regarding the potential value of the deposits. More recently manganese has been reported on the island of Maewo, and there have been unsubstantiated rumours of the presences of nickel, chromite, copper, cobalt, gold and coal, as well as sulphur on islands other than Vanua Lava. With the examination of the sulphur and manganese deposits as the principal object, the writer visited the New Hebrides from 7th July to 14th August 1951, and took the opportunity of following up the rumoured occurrences of economic minerals as far as circumstances permitted. This report gives an account of the visit and its findings.

  • 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.