This is a boxed set consisting of a 444-page book and seven previously published maps at scales ranging from 1:25,000 to 1:500,000. Maps include overviews at 1:500,000 and 1:250,000, four 1:100,000 sheets covering the entire area, and detailed maps of the Bugle Gap (1:50,000) and Windjana Gorge (1:25,000) areas. Together, they provide the definitive reference on the fascinating and economically significant reef complexes of Western Australia’s Canning basin. Economic interest stems from the Blina …

Devonian Reef Complexes of the Canning Basin, Western Australia.Phillip E. Playford, Roger M. Hocking, and Anthony E. Cockbain. Geological Survey of Western Australia Bulletin 145. Pp. 444. 2009. ISBN 978-1-74168-233. Price Aus$77.

The late Paleozoic Ice Age along the southwestern margin of Gondwana: Facies models, age constraints, correlation and sequence stratigraphic framework

This chapter provides comprehensive descriptions of 52 numbered formations/rock units of the Southeastern Oman Mountains, based on available literature. The oldest eight siliciclastic and carbonate formations are positioned below the ‘Hercynian’ Unconformity. The overlying formation (9–16) mostly represent carbonates which accumulated in a passive margin platform setting during or after the opening of the Neo-Tethys Ocean. The passive margin slope and platform collapsed during the late Cretaceous because of the obduction of the Semail Ophiolite along with the deep marine Hawasina sedimentary rocks. The collapsing passive margin interval was recorded within the syn-obductional Aruma Group (17; Muti Formation). Above this formation are the allochthonous units (18–42) of the tectonically lower Hawasina deep-sea basin and the structurally overlying Semail Ophiolite. The former contains Permian to Upper Cretaceous formations, while the latter is Cenomanian in age. Above the allochthonous rocks, the Neo-autochthonous formations were deposited, starting with the post-obductional uppermost Cretaceous Aruma Group (43; Al-Khod Formation) until the Quaternary deposits (52). All these formations/rock units are depicted on an accompanying map and stratigraphic chart.

Chapter 2 Tectonostratigraphy of the eastern part of the Oman Mountains

Find a match with triple-dating: Antarctic sub-ice zircon detritus on the modern shore of Western Australia

Field observations in conjunction with aerial images from an unmanned aerial vehicle were used to create the first map of a glacial unconformity underlying the late Carboniferous Dwyka Group of South Africa. Crosscutting relationships reveal that the glacial unconformity at Oorlogskloof, in which flutes, grooves, and striae were ploughed into unconsolidated sand, formed in a three-phased process charting a periodic shift in the locus of subglacial erosion. The unconformity formed by a periodically decoupled ice sheet in a probable tidewater setting. This model contrasts with earlier views that the structures simply record progressive ice-margin liftoff during transgression, and they provide unique insight into the complex temporal development of a 300 Ma subglacial environment.

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Udo Zimmerman

Papers

Detrital zircon provenance of Permo-Carboniferous glacial diamictites across Gondwana