This Bulletin presents the results of detailed studies of the Tertiary marine sequence in Gippsland, Victoria. Most of the information used in it has been obtained as a result of scout drilling jointly by the Victorian and Commonwealth Governments and of wildcat drilling by private companies. Though primarily a detailed study of a local problem, the results cannot frail to have an important bearing on the stratigraphy of the Tertiary rocks in the Australasian region and this in turn will facilitate the study of problems involving palaeogeography and correlation with extra Australian areas. The results will also have an important bearing on a major economic problem the search for oil in Australia.

The collection of rocks from the Ok Ti River, Western Papua, was made by Mr. L. Austen in 1922 and is housed in the Commonwealth Palaeontological Collection. It consists of shelly and foraminiferal limestones of Miocene age. The present examination of the collection is being undertaken at the request of the Australasian Petroleum Company, Melbourne.

The barite deposits are about three miles northeast of Bredbo, which is nearly 50 miles south of Canberra. This report provides a description of the deposits.

Report on a seismic survey carried out in order to determine whether the vibrations from blasting, when transmitted through the ground, were sufficient to cause structural damage to residential properties in the vicinty of the quarry at Balls Head.

The occurrence of molybdenite deposits near Yetholme has been known for many years. The most important deposits are close to the eastern boundary of Ph. Yetholme, Co. Roxburgh. The deposits have been worked in a small way for molybdenite at several places, have been examined by several geologists, and have been investigated by two of the major mining companies. The result of this work has shown that although considerable tonnages are available, the molybdenite content is too low to make mining attractive. It is not proposed to describe the geology, mining excavations, and other factors affecting the field in this report since that has already been done in several previous reports. It is the purpose of this report, however, to point out that the Yetholme deposits contain a considerable amount of scheelite and may well warrant large scale mining for this now important ore of tungsten.

A geological examination of the Renison Bell Tin Field was made in company with Mr. H.G.W. Keid, Field Geologist, Tasmanian department of Mines, during January and February, 1942. Workings, lode outcrops and the principal topographical features were mapped by plane table on a scale of 100 feet to an inch, and all accessible underground workings were plotted on a scale of 40 feet to an inch. Surface exposures were poor, owing to dense growth of bracken and other scrub and were largely confined to the vicinity of present or previous workings, tramlines, tracks, roads and railway lines. The history and production, geology, and economic geology of the field are outlined. The individual lodes are described in some detail. Methods of mineral exploration are discussed.

The felspar deposit near Londonderry was examined on Saturday, September 11th, 1943. The deposit has been worked by open cut, the size and shape of which are given in the plan accompanying this report. The report comprises rough notes on mineral assemblage and production figures.

Results of a microscopic examination of cores from bores Nos. 86 and 92.

The dykes which contain the felspar outcrop lie on the western slope of a hill two miles east of Wodonga, and south-southeast from Albury. This report comprises notes on the occurrence of the felspar and descriptions of the individual deposits.

An inspection was made on Sunday, September, 5th of a pegmatite dyke about five miles southeast of Greg-Greg in the Upper Murray district, New South Wales. This report comprises notes on felspar occurrence.