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Flinders River Springs SupergroupFlinders River Springs SupergroupClick on elements of the model or select from the tabs below The Flinders River supergroup spans the Euroka Arch a basement structure partially separating the Carpentaria Basin from the Eromanga Basin. Granite provides the basement in the northern Eromanga Basin in the southwest of the supergroup and is exposed in a very limited area by the Kevin Downs Fault. The basement of the Carpentaria Basin in the vicinity of the springs are metamorphosed sediments and these Precambrian schists outcrop in the vicinity of springs at Mt Fort Bowen, Mt Brown and Mt Little. The Gilbert River Formation forms the lower unit of the Mesozoic sedimentary sequence and is the main water-bearing aquifer for the springs in this supergroup. Some stratigraphic sequences in bores describe Hooray Sandstone, Cadna-owie Formation and Wyandra Sandstone, but these units are synonymous with facies within the Gilbert River River. This sandstone is overlain by a sequence of Cretaceous units, the Wilgunyah Formation, the Toolebuc Member and the Allaru Member that act as aquitards. The Gilbert River Formation outcrops extensively in the eastern part of the Supergroup and there are many large outcrop springs, many of which are isolated in rugged ranges, providing baseflow for major streams including the Woolgar, Norman, Clara and Yappar Rivers. In addition to the isolated outcrops of granite and metamorphic rocks in the western edges there are important structures relating to springs. A large network of springs is aligned in the vicinity of the Woodstock Structure, a pronounced section of the Euroka Arch. Another structure clearly associated with springs is the north-south trending St Elmo Structure. Tectonic activity that created these structures during the Paleozoic has reactivated to result in minor faulting. Additional information
Last updated: 27 May 2015 This page should be cited as: Queensland Government, Queensland (2015) Flinders River Springs Supergroup, WetlandInfo website, accessed 30 December 2024. Available at: https://wetlandinfo.des.qld.gov.au/wetlands/ecology/aquatic-ecosystems-natural/groundwater-dependent/supergroup-flinders/ |