This report describes the results of a micropalaeontological examination of samples taken from a depth of 10 feet down to 101 feet 6 inches.

This report describes the physiography and the history of the development of the North Stradbroke Island. Two accompanying plates are included.

This report describes the results of a micropalaeontological examination of samples taken at varying depths from bores Nos. 2, 10, and 22 respectively.

The eastern boundary of the area (the western boundary of D.C. 22) from Peerless Avenue to Ocean Street, was bored in August, 1947. The remainder of the area was bored in April, 1948. Bore-holes were put down to water level, using post-hole digger. Samples were dried and weighed and their volumes determined. The samples were then concentrated by panning, and the weights and volumes of the concentrates were determined. The percentage composition of a composite sample of concentrates from each bore line was determined by grain counting. The data collected and the findings of the investigation, including estimates of the quantities and grades of heavy mineral concentrates, the quantities of overburden and the quantities of each of the heavy minerals, are tabulated in this report.

This work was undertaken to extend regional mapping in the central and western portions of the A.C.T. and to provide a geological map of the Cotter River Area for use in engineering investigations. The regional geology portion of the Cotter Valley between Gingera and Bull's Head had previously been mapped on a scale of 1/2 mile to the inch, and this map was extended, by the recent survey, northwards to the Territory border and north-easterly to the Murrumbidgee River.

Systematic testing of South Stradbroke Island was started on 5th January, 1948. The boring and concentrating of samples were carried out by Associated Minerals Pty. Ltd., Southport. Sitting, levelling and mapping of boreholes was carried out by the Bureau of Mineral Resources. Between January and June, boring was directed towards the high active dunes adjacent to the east coast, and the areas of fixed, vegetated dunes west of the active dunes. The results of the testing work are recorded in this report. The occurrence of heavy minerals has been tabulated. Eight accompanying locality, section, and contour plans are included.

The area was bored and sampled in May, 1948. Bores were put down to water level, using a post-hole digger. When the sand brought up from the boreholes appeared to contain appreciable quantities of heavy minerals, it was sampled by quartering. Sample weights, volumes, and dry concentrates were determined. Percentage composition of concentrates was determined by grain counting. The estimates of the quantities and grades of heavy mineral concentrates, the quantities of overburden, and the quantities of each of the heavy minerals are tabulated in this report. Data collected in the course of the investigation has been tabulated and is appended. Accompanying locality and section plans have been included.

Brief description of limestone from a locality half a mile north of Cape Leeuwin Lighthouse.

Report on samples from the No. 1 bore, allotment 57. The samples described in this report were taken from the depth of 1130 to 1260 feet down and are in continuation of the series reported upon in record 1948/050.

In the Preliminary Report on Cambrian Fossils (1948/073) collected in the Northern Territory, locality B.68, 20.4 miles west of Djarra, was placed among the localities with the western development of the Middle Cambrian Xystridura-fauna. Mr. P.B. Nye has drawn the writer's attention to the fact that the Djarra locality is in Queensland 90 miles east from the Northern Territory border; i.e. far away from those localities with a typical "western fauna" and near those with an "eastern fauna". A re-examination of the fossils and palaeogeographical interpretation of the locality near Djarra therefore becomes necessary.