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The Ordovician age of the limestone at the Belubula River was recognized by the present writer from fossils collected by Mr. N.C. Stevens, University of Sydney. Thought, in the opinion of A.A. Opik, the first collection examined was completely convincing, Mr. Stevens approached the Chief Geologist, Dr. N.H. Fisher, early in 1951 for further support in the field. It was then decided that A.A. Opik, being responsible for the age-determination of the fossils from the Belubula River, Cliefden Caves area, would accompany Mr. Stevens on a field excursion to collect more evidence for the age of the limestones and to look for an occurrence of Silurian fossils in the same area. The results of this examination are given in this report, comprising a description of the Ordovician sequence, and a summary of the stratigraphy and correlation of the Ordovician Belubula River.

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.

The boring campaign carried out during 1950 by the Petroleum Technology section of the Bureau proved the existence over an area of 25 square miles in the Oaklands-Coorabin coalfield of approximately 793,000,000 tons of coal with an average calorific value of 9150 B.Th.U. per 1b. Thickness of the coal intersected in the bores ranged from 18 to 59 feet and depth to the coal from 186 to 565 feet. This report comprises detailed coal analyses, notes on the geological results, and recommendations for future boring.

The present report summarises the progress in the study of Cambrian fossils from the Northern Territory and north-west Queensland. The material being studied consists of large collections made in the Barkly Tableland by members of the Bureau of Mineral Resources, and a selected set of fossils borrowed from the Australian Museum. In addition, a comparatively complete collection from the Ord River and Mt. Panton is available for comparison. This report provides an overview of the work being carried out. Brief summaries are provided of the present state of research done by A.A. Opik, and of papers planned by other authors.

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 magnetic survey of the Kunimo creek area near Kuta in the Central Highlands of New Guinea was carried out between July 17th and July 28th, 1950. It was hoped that the survey would trace the course of the auriferous wash originally laid down in the bed of a former creek but now concealed by overburden of soil and unconsolidated volcanic ash. This report gives an account of the magnetic survey and its results.

A reconnaissance geological and radiometric survey of the Mt. Cavenagh area was carried out by B.P. Walpole and J. Sleis of the geological section and J. Daly and D. Dyson of the geophysical section of the Bureau of Mineral Resources. The objects of the survey were to examine reported occurrences of radioactive minerals in this area and to determine whether further prospecting of the area for radioactive orebodies was warranted. The general geology of the area, and the economic geology of the six prospects examined, are described in this report.

This statement, supplemented by graphic bore logs, sets out the results of a drilling campaign conducted at Cocked Hat Creek immediately west of the village of Young Wallsend, Newcastle district, by the Bureau in accordance with an agreement between the Mines Department of New South Wales, the Joint Coal Board and the Bureau. The area covered by the drilling grids totals about 200 acres, and includes parts of Portions 55, 69, 73 and 79, Parish of Teralba, County of Northumberland. It is known that this area, and a large extension to the north amounting to at least 4 square miles, is underlain by the Australasian seam which had been intersected at 50 feet from the surface in Portion 60 where it is approximately coincident with sea-level. Also the seam is exposed at various points along the northern margin to the larger area at elevations ranging from 170 to 220 feet. The purpose of the drilling was to test the thickness and quality of this seam, hitherto almost unknown factors, and to determine whether a potential open-cut site worthy of more exhaustive investigation exists.