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| Rewan Group | |
|---|---|
| Name | Rewan Group |
| Type | Geological group |
| Period | Carboniferous |
| Age | Mississippian |
| Region | Queensland |
| Country | Australia |
Rewan Group The Rewan Group is a Mississippian-aged stratigraphic unit in central Queensland known for its sedimentary sequences and fossil assemblages. It has been cited in studies alongside formations such as the Evergreen Formation, Bowen Basin successions, and correlations with units in the Eromanga Basin, Denison Trough, and Cooper Basin. Researchers from institutions including the University of Queensland, Commonwealth Scientific and Industrial Research Organisation, and the Australian Museum have contributed to mapping and analysis.
The Rewan Group was first described during surveys by the Queensland Geological Survey in the early 20th century, with subsequent field work by geologists associated with the British Geological Survey, CSIRO, and the Geological Society of Australia. Early correlation attempts referenced work by Alexander Du Toit, Arthur Holmes, and regional studies by Herbert Gepp. Later revisions incorporated stratigraphic principles from the International Commission on Stratigraphy and mapping programs tied to the Australian Stratigraphic Units Database. Exploration drilling by companies such as BHP, ExxonMobil, Santos, and Chevron expanded knowledge of the group's subsurface extent.
The Rewan Group comprises a succession of beds correlated with the Mississippian stage and is commonly divided into several formations, informally compared to the Springbok Flats Formation and Rundle Group in adjacent terranes. Lithologies include sandstones, siltstones, mudstones, and subordinant conglomerates, with cementation and mineralogy studied using techniques pioneered by X-ray diffraction laboratories at CSIRO and petrographic work influenced by Norman L. Bowen concepts. Stratigraphic relations to overlying Permian and underlying Devonian sequences were refined using tools developed by the United States Geological Survey and the Australian Bureau of Mineral Resources. Regional columnar sections have been matched with marker horizons used in correlation exercises by the International Union of Geological Sciences.
Fossil content within the Rewan Group includes marine and marginal-marine taxa that have been compared to assemblages from the Carboniferous basins of Euramerica and Gondwana. Identified fossils comprise brachiopods similar to genera documented by James Hall and Thomas Davidson, bivalves comparable to specimens described in the Palaeozoic Fossil Record, and conodont elements used for biostratigraphic zonation following schemes from H. E. B. Baker and Wallace A. Copeland. Plant remains and lycopsid fragments have been linked to taxa reported by William Nicholson and Adolphe Brongniart, while trace fossils have been interpreted using ichnological frameworks advanced by Martin G. Lockley and Ronald S. Bromley. Vertebrate remains are rare but have been compared to Devonian-Carboniferous transition finds cataloged in collections at the Queensland Museum and the Natural History Museum, London.
Sedimentological and facies analysis indicates deposition in fluvial, deltaic, and shallow marine settings, with tidal influence inferred by comparisons to modern analogs studied near the Fly River and paleoenvironmental models developed by Andrew Miall and Peter A. Christie-Blick. Facies assemblages echo patterns observed in the Perth Basin and Officer Basin sequences, with sequence stratigraphy frameworks influenced by the work of Peter Vail and William R. Farrand. Paleocurrent data and provenance studies link sediment sources to uplifted terranes comparable to those in the Great Dividing Range and correlate with tectono-sedimentary events tracked by researchers associated with the Australian National University.
The Rewan Group has been evaluated for hydrocarbon potential during basin modeling studies by Santos, Woodside Petroleum, and academic partners at Monash University and The University of Adelaide. Coal and coal-seam gas plays identified in correlative Mississippian units such as those exploited by Peabody Energy and Arch Coal elsewhere have motivated resource assessments. Dimension stone and aggregate from sandstone units have local use, with quarrying regulated under standards influenced by the Australian Standards (AS) system and environmental oversight linked to the Queensland Department of Environment and Science.
Ongoing research combines biostratigraphy, chemostratigraphy, and geochronology using methods refined at laboratories like ANSTO and analytical centers at the University of Western Australia. Collaborative projects have involved the Australian Research Council and international partners such as Geoscience Australia, the Smithsonian Institution, and universities including Cambridge University and University of Edinburgh. Future exploration targets include detailed basin modeling, seismic interpretation employing techniques from the Society of Exploration Geophysicists, and paleoclimate reconstructions referencing datasets curated by the Paleobiology Database and the International Geoscience Programme.
Category:Geologic groups of Australia