The position of the area described here as the 'Headwaters of the Burke River in the tropical zone of Australia is evident from the locality map, Figure 1. Topographically it is part of the Selwyn Range, which is a divide composed mainly of metamorphosed Precambrian rocks. These are described by Carter (1959), Carter & Brooks (1960), and Carter, Brooks, & Walker (1961). Structurally it is part of the Burke River Outlier, within which the Selwyn Range is built of Cambrian sediments, which are referred to as 'the Selwyn Range sequence'. This sequence is preserved here owing to post. Cambrian faulting that involves the whole Outlier; the Outlier itself is the northern segment of the Burke River Structural Belt, which extends south for another hundred miles. The headwaters of the Burke River are in the Selwyn Range, north-western Queensland. Exploration began in 1860; Cambrian fossils were discovered in 1931. Mapping by the Commonwealth Bureau of Mineral Resources (1952-1958) amplified the knowledge of the geology and palaeontology of the area. Four formations (Roaring Siltstone, Devoncourt Limestone, Selwyn Range Limestone, and O'Hara Shale) and one unit of beds (Mount Birnie Beds) constitute the Cambrian of the Selwyn Range sequence. The Mount Birnie Beds (sandstone, arkose, regolithic clay) occurs as erosional residuals on the basement. Unconformably above follows the Roaring Siltstone with shale and sandstone interbeds; above it rests the Devoncourt Limestone, flaggy and bituminous; the next higher is the Selwyn Range Limestone, a caIcilutite with chert and marly interbeds, overlain by the O'Hara Shale with interbeds of chert and sandstone. A Mesozoic conglomerate (erosional residuals) and alluvial deposits conclude the sequence.The position of the area described here as the 'Headwaters of the Burke River in the tropical zone of Australia is evident from the locality map, Figure 1. Topographically it is part of the Selwyn Range, which is a divide composed mainly of metamorphosed Precambrian rocks. These are described by Carter (1959), Carter & Brooks (1960), and Carter, Brooks, & Walker (1961). Structurally it is part of the Burke River Outlier, within which the Selwyn Range is built of Cambrian sediments, which are referred to as 'the Selwyn Range sequence'. This sequence is preserved here owing to post. Cambrian faulting that involves the whole Outlier; the Outlier itself is the northern segment of the Burke River Structural Belt, which extends south for another hundred miles. The headwaters of the Burke River are in the Selwyn Range, north-western Queensland. Exploration began in 1860; Cambrian fossils were discovered in 1931. Mapping by the Commonwealth Bureau of Mineral Resources (1952-1958) amplified the knowledge of the geology and palaeontology of the area. Four formations (Roaring Siltstone, Devoncourt Limestone, Selwyn Range Limestone, and O'Hara Shale) and one unit of beds (Mount Birnie Beds) constitute the Cambrian of the Selwyn Range sequence. The Mount Birnie Beds (sandstone, arkose, regolithic clay) occurs as erosional residuals on the basement. Unconformably above follows the Roaring Siltstone with shale and sandstone interbeds; above it rests the Devoncourt Limestone, flaggy and bituminous; the next higher is the Selwyn Range Limestone, a caIcilutite with chert and marly interbeds, overlain by the O'Hara Shale with interbeds of chert and sandstone. A Mesozoic conglomerate (erosional residuals) and alluvial deposits conclude the sequence.

F55/B1-38 Contour interval: 5

Legacy product - no abstract available

Legacy product - no abstract available

No abstract available

F55/B1-13 Vertical scale: 100

No abstract available

A reflection seismic survey was conducted in 1959-1960 by Geophysical Service International, S.A. for West Australian Petroleum Pty Limited. The survey took place within the Canning Basin in Western Australia. The purpose of the survey was to investigate certain anomalies which had been indicated by a previous refraction seismic survey. The reflection seismic survey consisted of 63 miles of continuous profiles, and the interpretation of the results obtained over part of the prospect was controlled by three closed loops. Four anticlinal structures were located in an area where the thickness of pre-Permian sediments is believed to be between 4000 feet and 5000 feet. One of these structures is in the form of an anticlinal nose plunging to the south-west with the open end facing northeast. The other three structures are anticlinal structures closed by faults.

A gravity survey was conducted by Mines Administration Pty Limited for The Papuan Apinaipi Petroleum Company Limited between May and August 1959. The survey took place over seven separate areas within Authority to Prospect 54P in north-western Queensland. The areas surveyed are partly within the Georgina Basin and partly within the Diamantina Basin. These Basins contain Palaeozoic sedimentary rocks. Sedimentary rocks of the Great Artesian Basin overlap the whole of the Diamantina Basin and part of the Georgina Basin. The survey results, together with data obtained previously by the Bureau of Mineral Resources, indicated four distinct zones of gravity "highs" which all trend northnorth-west. Most and perhaps all of these zones coincide in the north with structural features in the Proterozoic sediments. The gravity anomalies associated with these Proterozoic structural features continue southward, where the Proterozoic rocks' are overlain by later sediments, with little or no decrease in absolute gravity. In some areas these Proterozoic structural features have influenced structural development in the Palaeozoic and Cretaceous sediments. The four zones of gravity "highs" are therefore regarded as areas of structural interest that are worthy of further exploration.

A seismic reflection survey was conducted for Cree Oil of Canada Limited during May 1960, by Austral Geo Prospectors Pty Ltd, in the south-central part of Area 3, Authority to Prospect No. 64P, Queensland, Australia. Using the spot character-correlation method a single 67-mile seismic traverse was shot from Longreach to Silsoe Homestead. Results of the survey indicate that the sedimentary sequence increases in thickness from approximately 3200 ft at Longreach to approximately 6000 ft at Silsoe Homestead. A significant east reversal inregional west dip was recorded about 13 miles west of Longreach.