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• W2023999945 abstract "Adelaidean (late Precambrian) sequences in the Kimberley Region, Western Australia, contain undisputed evidence of glaciation. In the East and West Kimberleys, only a single major glacial epoch is represented, but in the Mount Ramsay area, there are upper and lower glaciogenic deposits. In the past, the lower of these (Landrigan Tillite) has been correlated with the Walsh Tillite of the West Kimberleys and the Moonlight Valley Tillite of the East Kimberleys. Detailed lithological comparisons of the tillite-bearing sequences suggest more precise lithostratigraphic correlations in the Kimberley Region. In particular, it is proposed that the Walsh Tillite and Moonlight Valley Tillite correlate with the Egan (upper tillite) Formation, and that the sequences above these glaciogenic rocks can also be largely matched, the most complete section being preserved in the East Kimberleys. The Landrigan Tillite of the Mount Ramsay area is the only representative of the lower glacials in the Kimberleys. Detailed lithological comparisons can be extended to the central Australian basins (Northern Territory) and to the Adelaide Geosyncline (South Australia). They indicate that the Landrigan Tillite correlates with Sturtian tillites of South Australia and with the Areyonga Formation (Amadeus Basin), Naburula Formation (Ngalia Basin) and Mount Cornish Formation and Yardida Tillite (Georgina Basin). The Egan Formation, Walsh Tillite, Moonlight Valley Tillite (and probably also the slightly older Fargoo Tillite) represent the Marinoan glaciation and correlate with tillites in the Elatina Formation and Yerelina Subgroup of the Adelaide Geosyncline, the Olympic Formation of the Amadeus Basin and the Mount Doreen Formation of the Ngalia Basin. Critical examination of the geochronology of glacial and post-glacial sequences in the Kimberleys indicates that only the shales overlying the upper glacials are reasonably well dated (672 ± 70 Ma for the Ranford Formation, 670 ± 84 Ma for the Throssell Shale, and 639 ± 47 Ma for the Elvire Formation). Previously quoted ages for the Landrigan Tillite are unreliable, as they are based on samples from three separate formations of different age. The geochronological results cannot be used to support the previously accepted correlations. Recent shale datings from South Australia lend qualified support to the proposed revised correlations. Comparison with published dates on tillites from other continents does not preclude the possibility of approximately synchronous glaciations affecting very large areas of the Earth during the late Proterozoic." @default.
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• W2023999945 date "1980-11-01" @default.
• W2023999945 modified "2023-09-27" @default.
• W2023999945 title "Stratigraphic and geochronological reinterpretation of late Proterozoic glaciogenic sequences in the Kimberley Region, Western Australia" @default.
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• W2023999945 doi "https://doi.org/10.1016/0301-9268(80)90004-2" @default.
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