Product Specifications Coverage: Partial coverage, predominantly in northern Australia, along major transport routes, and other selected areas. About 1000 maps have been published to date. Currency: Ranges from 1968 to 2006. Coordinates: Geographical and UTM. Datum: AGD66, new edition WGS84; AHD. Projection: Universal Transverse Mercator UTM. Medium: Paper, flat copies only.

Legacy product - no abstract available

The Pacoota Sandstone is a thick (up to 850 m) deposit of siliciclastic rocks straddling the Cambrian- Ordovician boundary in the Amadeus Basin of central Australia. It is economically the most important hydrocarbon reservoir of the basin, contains a potentially significant reserve of phosphorite, and may be an important aquifer. The internal stratigraphy of the Pacoota Sandstone, not previously documented in detail on a basin-wide scale, is based here on a sequence of four informally defined sedimentary packages, separated by unconformity or disconformity. The age and stratigraphic distribution of these sequences is measured against a preliminary and equally informal biostratigraphic scheme, which involves body-fossil and ichnofossil assemblages. Although a late Cambrian-early Ordovician age has long been known, it is now possible to date the sequences, at least to stage-level of resolution. Sequence 1, characterised by channel-fill sediments at several localities, is Payntonian to early Datsonian (latest Cambrian). It overlies earlier Upper Cambrian (Mindyallan) formations with regional unconformity, and it, in turn, is overlain unconformably by Sequence 2. The latter is a tidal and storm-dominated sequence with concentrations of the Skolithos ichnocoenosis, but lacking age-diagnostic body fossils. It is separated by a further major unconformity from Sequence 3, comprising predominantly phosphatic and glauconitic clastic sediments of latest Warendian (late Tremadoc) age, which thus indirectly date Sequence 2 also. Sequence 4, which may be disconformable, at least in part on Sequence 3, again has storm and tidally dominated sandstones rich in ichnofossils, but impoverished in body fossils. The limited fauna that does occur dates this sequence at the Tremadoc/Arenig transition. The Pacoota Sandstone is in places unconformably overlain by the Horn Valley Siltstone, of early Arenig age.

Product Specifications Coverage: Partial coverage, predominantly in northern Australia, along major transport routes, and other selected areas. About 1000 maps have been published to date. Currency: Ranges from 1968 to 2006. Coordinates: Geographical and UTM. Datum: AGD66, new edition WGS84; AHD. Projection: Universal Transverse Mercator UTM. Medium: Paper, flat copies only.

These documents have been scanned by the GA Library. Please refer to the document for contents.

Product Specifications Coverage: Partial coverage, predominantly in northern Australia, along major transport routes, and other selected areas. About 1000 maps have been published to date. Currency: Ranges from 1968 to 2006. Coordinates: Geographical and UTM. Datum: AGD66, new edition WGS84; AHD. Projection: Universal Transverse Mercator UTM. Medium: Paper, flat copies only.

A microearthquake survey around the fault scarp caused by the 1979 Cadoux, Western Australia, earthquake located 36 earthquakes (ML 0-2.4) over 7 weeks from October to December 1983. The earthquakes show a NNE-SSW trend on the westward side of the fault complex, consistent with a westward dipping fault plane. The earthquakes are evenly distributed along the length of the fault. The more accurately located earthquakes are 0-6 km deep.

Product Specifications Coverage: Partial coverage, predominantly in northern Australia, along major transport routes, and other selected areas. About 1000 maps have been published to date. Currency: Ranges from 1968 to 2006. Coordinates: Geographical and UTM. Datum: AGD66, new edition WGS84; AHD. Projection: Universal Transverse Mercator UTM. Medium: Paper, flat copies only.

Product Specifications Coverage: Partial coverage, predominantly in northern Australia, along major transport routes, and other selected areas. About 1000 maps have been published to date. Currency: Ranges from 1968 to 2006. Coordinates: Geographical and UTM. Datum: AGD66, new edition WGS84; AHD. Projection: Universal Transverse Mercator UTM. Medium: Paper, flat copies only.

No abstract