Legacy product - no abstract available

Conodont Biostratigraphy of the upper Devonian reef complexes of the Canning Basin, Western Australia

Biostratigraphy is the branch of stratigraphy that uses fossils to establish relative ages of rock and correlate successions of sedimentary rocks within and between depositional basins. A biozone is an interval of geologic strata characterised by certain fossil taxa. Such intervals are often defined by the first appearances (range bases), apparent extinctions (range tops/last appearances), or abundances of fossil index species. These key index species should be relatively abundant, short-lived taxa that are easy to recognise and as geographically widespread as possible. Widely used fossil groups include brachiopods, conodonts, dinoflagellate cysts, foraminifera, graptolites, nannofossil, spores and pollen and trilobites. Zonal schemes based on several different fossil groups can be used in parallel, and the zones can be calibrated to the absolute geological timescale using tie points to rocks which have been radio-isotopically dated.

Legacy product - no abstract available

The Arafura Basin contains a sequence of Palaeozoic rocks lying north-east of Darwin, and which extends from onshore Australia, to perhaps as far as the Irian Jaya mainland. There are over 9 km of Palaeozoic rocks preserved along the southern bounding fault of a major graben (the Arafura Graben) located in the southern part of the basin. In the uplifted centre of the graben, there is less than 3 km of the Palaeozoic section preserved. The basin is underlain by a Middle to Late Proterozoic sequence which thickens to the east, and is probably equivalent to the onshore McArthur Basin. Overlying the Arafura Basin is the Mesozoic Money Shoal Basin, which is approximately 1 km thick over the central parts of the graben, thickening rapidly to the west and thinning to the east and north. The structural cross-section that has been drawn is located entirely offshore. It has been compiled using modern seismic and well control. It runs from south-east of Tasman 1 in a general north and north-east direction tying with Torres 1 and Arafura 1. It passes through the central and north-eastern parts of the graben, and the north-eastern part of the basin. Two-way time to depth conversions were based on the velocity surveys from the wells within the graben, but were modified locally outside the graben. The structural analysis presented is largely based on the evidence found along the line of the section. A more complete structural analysis would require a regional examination of the entire seismic network. Information from the recently published Petroleum Basin Study on the Arafura Basin (Northern Territory Geological Survey) has been incorporated into this report, although there are major differences between some of their findings and the interpretations presented here. To date the major risk in hydrocarbon exploration has been finding adequate reservoir conditions and seal. Contradictory interpretations are present between the maturation and structural modelling of the graben. Untested plays include possible Permian and Triassic sediments (up to 5 km thick) which exist along the flanks of the graben and which will probably contain good source potential and improved reservoir conditions. To the north outside the graben, there are poorly explored areas where it is speculated that there are thick Palaeozoic and Proterozoic sequences.

Elizabeth Creek project : buried mineral play in Century- equivalent strata, northern Lawn Hill Platform, Queensland. At foot of title: Prospectivity data package: Queensland Department of Mines and Energy restricted area 298

The London Bridge Limestone has been traced along its strike from a point five miles south-south-east of Queanbeyan to a point three miles south-east of Bredbo, a distance of forty miles. At London Bridge this formation attains its greatest development and a large-scale geological map of this area has been prepared. Fossil collections have been made from localities along this formation and the fauna has been examined. A description of the coral Pycnostylus ? sp. nov. is given. The stratigraphical position of this formation has been placed within the Wenlock Epoch, possibly within the Lower Wenlock.

This report describes the results of a micropalaeontological examination of samples taken from a depth of 0 to 922 feet down.

This report describes the results of a micropalaeontological examination of samples taken from a depth of 0 to 250 feet.

This report deals with the results of 22,355 ft. of scout boring over an area of approximately 50 square miles on the western flank of the Muswellbrook (N.S.W.) Anticline. A traverse of overlapping bore-holes, located between the outcrops of the Upper Marine Series (Mulbring Beds) in the east and of the Triassic sediments in the west; provided a more complete section of the Upper Coal Measures in this area than has been previously available. Some 46 coal seams were encountered and tentatively numbered for correlation. Some of the coal seams exhibit very good qualities, but none could be classed as a good gas or coking coal. Igneous intrusions are numerous and of a fairly wide vertical and areal extent; their influence on the associated coal seams is generally destructive. The results of the above boring may be regarded as a basis, for any detailed future underground and/or open-cut mining investigations. No attempt was made to estimate coal reserves of any kind.