Results of a micropalaeontological examination of samples taken from 1460 feet down to 1619 feet. This series is in continuation of that reported upon on 19/3/46.

Results of a micropalaeontological examination of samples from a depth of 2 feet down to 1185 feet.

Results of a micropalaeontological examination of samples taken from between the depths of 1450 and 1800 feet.

The Cow Flat Area was visited on the 12th March, 1947, with the object of ascertaining possible dolomite reserves. This information was required in connection with the application by Metropolitan Lime and Cement Company Ltd., owners of a dolomite quarry at Wall's Siding, near Mudgee, for financial assistance from the Commonwealth Government. It was desired to ascertain whether, in the event of the latter company ceasing production, the Cow Flat deposit could provide sufficient dolomite to supply New South Wales requirements. The situation, production, geology, origin and reserves of the dolomite deposits are discussed in this report. The report should be considered supplementary to Report No. 1946/005 and the Report on Limestone and Dolomite Deposits at Cow Flat and Wall's Siding (1947/090).

Results of a micropalaeontological examination of samples taken from the depth of 3 feet down to 534 feet.

Overview of general work, staff involvement, drafting, field work and laboratory work carried out for the month of October, 1947.

Bauxite deposits on Rosedale, Meadowbank and Riccarton Estates at Campbell Town were tested by shaft sinking and boring during November, and December 1946. Earlier than this the Tasmanian Mines Department has sunk a number of shafts on the deposits, mainly at widely spaced intervals. The work undertaken by the Aluminium Commission mainly consisted of testing between the shafts sunk by the Mines Department, so that the interval between the points tested was reduced to 200 feet or less. A few of the old shafts were cleaned out and re-sampled. The results of the tests at each estate are reported on.

The question of a geophysical survey of the Copperhead mining property at Bullfinch was discussed and it was stated that there was need for a geophysical survey to determine the detailed structure of the jaspilite bodies over a small area concealed by tailings at the eastern end of the jaspilite zone. Following preliminary tests, a detailed survey was conducted in December, 1946. The geology, nature of the problem, and results of the survey are discussed in this report. Two accompanying plans are included.

Foraminifera were first recognized in the Permian sediments of Australia in 1882. Some systematic work on these micro-fossils was done up to 1905, but there was no further investigation until. 1937, since when five papers on Permian foraminifera have been published. However, about ten years ago, systematic sampling of outcrops, cores and cuttings from bores was commenced with the object of determining whether micro-faunal zones could be established. Core samples and drill cuttings from these bores: and the various outcrops have been examined by the writer and a microfauna identified. Surface samples from localities in New South Wales were also submitted by the Geology Department, University of Sydney, for micro-examination. From the information presented in the following sections of this bulletin, it will be seen that, although a considerable amount of research is still necessary before a definite system of zoning, based on the microfaunas, can be applied to the Permian rocks of Australia, such a system is possible. In the extensive collections of Permian rocks examined from the Hunter River District of New South Wales, assemblages of foraminifera rather than restricted species have proved useful for zonal purposes, and it will be shown that correlation of deposits in other States can be made, by means of these assemblages.

A geophysical survey of the Hampton Plains areas was conducted between September and December, 1946. The geology and nature of the problem, geophysical work, and results of the survey are discussed in this report. Accompanying plans are included.