At the invitation of Prof. S.W. Carey, the author visited Tasmania during the period 15th November to 2nd December, 1950, to take part in discussions on Cambrian geology in Tasmania and to learn in the field the results of recent investigations on Tasmanian older Palaeozoic rocks. During the visit the author had the opportunity of expressing his opinions both on newly discovered fossils and on the age of some Palaeozoic units, and the main object of this report is to record these opinions.

Nine samples of clays from Western Australia were received from R.S. Matheson for micropalaeontological examination. No microfossils were found in these clays. A description of these samples is given in this report.

Towards the end of 1950, the deep bore which the Shell Development Company was drilling to test for oil on the Morella structure, 35 miles south of Rolleston, entered andesite at approximately 4000 ft. After boring about 200 ft into the andesite, the Company decided to abandon the hole. A new site for a test bore was selected on the Comet anticlinal structure, 60 miles north of Rolleston. Before proceeding with this new test, evidence was needed to ensure that neither a shallow basement nor volcanic rocks existed under this structure. The Bureau was therefore asked to shoot a refraction traverse over the anticline, in order to determine if basement rocks were likely to be present at a shallow depth. As a result the Bureau sent a seismic party to the area during January 1951. Fairly definite evidence was obtained of basement velocities occurring at a depth of less than 3000 ft, and after discussions, a decision was made not to proceed with the drilling of the Comet structure. The results have now been investigated in detail and are presented in this report.

Field work at Rum Jungle commenced on 18th May and terminated 15th November. The greater part of the field season was spent in detailed geological and geophysical examination and testing of White's Deposit, Dyson's Find, Mt. Fitch Radioactive Area, Brown's Workings, and Brown's Extended. The results of these investigations are summarised in this report.

Mount Hope, a small town in Central New South Wales, is south of and 101 miles by main road from Cobar, and 11 miles north of Matakana siding on the Sydney-Broken Hill railway line. The ores mined in the Mount Hope district have been mainly those of copper, the principal mines being the Mount Hope mine, close to the town, and the Great Central and Comet mines, three miles further south. At present, the only mine in production is the Mount Hope mine, where the leaching process is being used by the Caroline Copper Mines. At the request of North Broken Hill Ltd., geophysical surveys were carried out on two areas: the Mount Hope mine area, and the Comet Mine area. The field work was commenced in May, 1950, and occupied three months. This report gives an account of the geophysical surveys and their results.

A micropalaeontological examination was conducted on a sample of diatomite from Redesdale. The results of this examination are described here.

This report is a detailed stratigraphical and structural study of an area of some 40 square miles south-east of Cobar together with a geological reconnaissance of an area of 500 square miles in the Cobar-Canbelego district. The purpose of these investigations was the elucidation of the general geology and the problem of ore localisation in the Cobar-Nymagee-Canbelego metalliferous province.

A sample of limestone from Bougainville was submitted for micropalaeontological examination. The results of this examination are described here.

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.

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.