For the first time the hypostoma of an eodiscid trilobite, Pagetia bootes Walcott, is described. The presence of a doublure with terraced lines, and schizochroal eyes as observed on Australian Pagetiae, is mentioned. Obviously the trilobite nature of the Eodiscidae is no longer in question.

This collection of fossils from the Portland area consists chiefly from mollusca, but where a small portion of sediment was attached to the fossils, it was removed and washed down for micro-examination. The number given to each sample refers to the registered number in the Victorian Geological Survey Collection. The results of the examination are recorded in this report.

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The Zeehan silver-lead-zinc field is in the West Coast Region of Tasmania. Following on the geophysical work carried out for Zeehan Explorations in 1947-1948, the Bureau was requested to carry out a survey on the Mariposa lease held by North Broken Hill Ltd. The purpose of the survey was to examine the Mariposa area for possible magnetic and gravity effects associated with the known mineralization and thence to determine the extent of this mineralization; and also to investigate the swamp covered limestone area for hidden mineralization. Further, it was considered that the results of the survey and behaviour of the instruments in the difficult terrain would serve as a guide to the usefulness of the magnetic and gravity methods in other similar prospecting areas in the Zeehan field. An account of the geophysical work and its results is given in this report.

The Walloway Artesian Basin is approximately 160 miles north of Adelaide and is traversed by the main road from Adelaide to Maree via Orroroo and Hawker. The town of Orroroo lies on its western margin in the south-western corner of the Hundred of Walloway and the village of Johnburgh is situated in its northern part. The geophysical survey was carried out at the request of the Director of Mines for South Australia to assist his Department in the selection of sites for boring for artesian water and to delineate more precisely the limitations of the basin with regard to artesian flows. The gravity method was used as this method has proved successful elsewhere in determining the dimensions and form of sedimentary basins. This report gives an account of the survey and its results.

At the request of the Defence Supply Planning Branch of the Department of Supply an investigation of the Australian graphite industry was undertaken early in 1950. The particular aspects to be considered in this investigation were listed by the Planning Branch as follows: the specific defence significance of graphite and an estimate of peace and probable wartime demands, the experiences during World War II where applicable, the present and future supple position, alternative methods of ensuring that demands are met in an emergency, and the method recommended to meet demands in an emergency. This report should be considered an interim report containing recommendations for early consideration by the Planning Branch.

During May, 1950, a sample of granitic material was obtained from a dump on the Sunnyside goldfield, and showing a few flakes of a green mineral similar in appearance to torbernite, was forwarded to the Department of Mines, Melbourne, by a miner working on that field. The Mines department tested the mineral and proved that it was uranium-bearing, and submitted a sample to the Bureau to test for radioactivity. After confirmation of the presence of radioactivity in the sample by laboratory tests, a brief visit was paid to the field by a party from the Geophysical Section. One day was spent for conducting tests on the field. The opportunity was taken of visiting the Maude and Yellow Girl mine, and testing ores and concentrates for radioactivity.

Tamborine Mountain lies about 35 miles south-south-east from Brisbane. Laterite occurs in the north-western portion of the mountain and in general occupies the more elevated areas. The bauxite deposits have been known for many years and have been exploited as a source of road metal and more recently for the manufacture of aluminium sulphate. The occurrences have been described briefly by Ball (1940), Curteis (1942), and Connah (1950). Mr. W.S. Curteis conducted testing operations by shaft-sinking on behalf of Messrs. Sulphates Limited. The results of this work have been made available to the writer by the Company and have been used herein. During June 1950 the writer accompanied Mr. T.H. Connah to Tamborine Mountain during a very short visit, and again examined the area in November. The geology of the area, bauxite, and bauxite reserves at Tamborine Mountain are described in this report.

Seven samples were collected from the 16-mile Government bore, 16 miles west of Alice Springs, and forwarded for examination. This report gives a detailed description of these samples.