22-2/F52-8/3-2

22-2/D51-16/4-2 Vertical scale: 300

22-2/D51-12/4-1 Vertical scale: 300

22-2/D52-11/3-5

13.5 x 13.5 km extension into NW corner of Moyle 100k sheet 22-2/D52-11/1-2 Contour interval: 1

22-2/D51-15/4-6 Vertical scale: 200

The Perth Basin is localised by reactivation of Neoproterozoic shear zones on the western margin of the Archaean Yilgarn Craton in Western Australia. While Ordovician to Silurian sandstones were deposited in the northern Perth Basin, the earliest sediments elsewhere are Middle Carboniferous to Permian in age. A sinistral transtensional regime, during which the main architecture of the basin was established, developed during NE-SW extension between Greater India and Western Australia in the Permo-Triassic. NW-SE shortening with continued NE-SW extension resulted in sinistral transpression in the late-Early to Middle Triassic. Sag-phase sedimentation in the LateTriassic followed this oblique rifting event. An analogy may be made between the Perth Basin and the Permo-Carboniferous to Jurassic Karoo basins in southern and central Africa and Madagascar. Deposition of the Karoo sequence took place within pull-apart and transtensional basins resulting from sinistral reactivation of basement shear zones. The Indian Gondwana Supergroup, and an equivalent sequence in Antarctica, were deposited within normal fault-bounded graben. The Late Paleozoic to Early Mesozoic formation of the Perth Basin, the Karoo basins of Africa and Madagascar, and the Gondwana basins of India was due to intraplate stress resulting from convergence along the Panthalassa margin of Gondwanaland. Late-Early to Middle Triassic compressional events in all basins mark terminal collision along the Panthalassa margin.

22-2/J55-1/4-2a Vertical scale: 400

Contents: 1.He F, Conaghan PJ. Diagenesis of Jurassic and Lower Cretaceous sandstones of the Eromanga Basin in New South Wales. 2.Minty BRS, Brodie RC. Mapping 137Cs at Maralinga nuclear test site, South Australia, using conventional 4-channel airborne gamma-ray spectrometry. 3.O'Brien PE, Burne RV. The Great Cumbung Swamp - terminus of the low-gradient Lachlan River, eastern Australia. 4.Foster CB, Gomankov AV. A new structure in pollen assigned to Striatopodocarpites Sedova 1956 and Protohaploxypinus Samoilovich emend. Morbey 1975, from the Late Permian (Tatarian) of the Russian Platform. 5.Foster CB, Balme BE, Helby R. First record of tethyan palynomorphs from the Late Triassic of East Antarctica. 6.Nicoll RS, Romine KK, Watson ST. Early Silurian (Llandovery) conodonts from the Barbwire Terrace, Canning Basin, Western Australia.

22-2/J55-1/4-6 Vertical scale: 100