1962
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Legacy product, no abstract available.
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Legacy product - no abstract available
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Legacy product - no abstract available
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Lower Cretaceous strata of the Katherine and the Fergusson River 1:250,000 Sheets were examined during the 1960 and 1961 field seasons. Field observations on lithology and palaeogeography were summarised in previous Records (Skwarko,1961a,b) and these, together with the identification of the fossils collected and their dating have provided material for conclusions expressed in the present Record. Of the thirteen assemblages of fossils collected on the Katherine-Ferguson River area, nine are marine and four consist of plant remains. They appear to range in age from Neocomian to uppermost Albian. Lower Cretaceous sediments.
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In May and June 1959 a regional gravity survey was conducted in Northern and Central Australia to provide additional data for a gravity map of Australia. 131 gravity stations were established, mostly in Northern Territory and Queensland. Commercial air transport was used; its advantages and limitations for this application are discussed. This form of transport enabled a large area to be covered rapidly with fairly accurate observed gravity values; however, the accuracy of the anomalies calculated is low, chiefly because of reliance on barometric levelling.
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Between January and March 1961 an official visit was made by the author to certain government organisations, oil companies, and airborne survey contracting companies in U.S.A. and Canada. The purpose of the visit was to study techniques of interpretation of aeromagnetic data, particularly in relation to oil exploration, and to attend a course in aeromagnetic interpretation at the United States Geological Survey in Washington. This Record contains the notes on discussions with specialists of the various organisations. Notes on other matters such as analysis of magnetic properties of rocks, properties of sedimentary rocks, age determinations of rocks, analysis of oil samples, and problems in interpretation of gravity data are also included.
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The basic rocks of the Katherine - Darwin region have been divided into eight geographical groups and the field relationships and petrology of the rocks from each group are discussed.
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Legacy product - no abstract available
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Test surveys over the Rum Jungle Creek and Rum Jungle Creek South prospects have shown that a strong electromagnetic anomaly, apparently due to a wide conducting body, is present close to the Rum Jungle Creek South ore body. The present Record refers to the results of further surveys using electromagnetic methods over several other uranium prospects in the Rum Jungle area.
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Legacy product - no abstract available