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| Murraba Formation | |
|---|---|
| Name | Murraba Formation |
| Type | Geological formation |
| Period | Neogene |
| Region | Murraba Basin |
| Country | Australia |
| Lithology | Sandstone, siltstone, shale, conglomerate |
| Thickness | 150–1200 m |
Murraba Formation The Murraba Formation is a Neogene stratigraphic unit exposed in the Murraba Basin of northern Australia that records sedimentation, tectonism, and biotic change during late Cenozoic time. The formation preserves fluvial, lacustrine, and deltaic deposits and yields vertebrate, plant, and microfossil assemblages used in regional correlation, palaeoenvironmental reconstruction, and resource exploration. Researchers from institutions such as the Australian National University, University of Queensland, CSIRO, and Geological Survey of Western Australia have published stratigraphic frameworks, sedimentological studies, and palaeontological inventories that reference the unit.
The Murraba Formation crops out in the Murraba Basin within the Kimberley region and intersects structural domains described by the Geological Survey of Western Australia, Australian Stratigraphic Units, and regional mapping projects led by geoscientists at Monash University and James Cook University. Field campaigns by teams affiliated with CSIRO and the National Museum of Australia documented sections used in correlations with the Eromanga Basin, Clarence-Moreton Basin, and adjacent sedimentary successions recognized by the Bureau of Mineral Resources. International collaborations with the University of Cambridge, Smithsonian Institution, and Natural History Museum (London) have contributed comparative palaeontological assessments.
The basin hosting the Murraba Formation developed within Proterozoic basement domains linked to the North Australian Craton and adjacent Palaeozoic orogens including the Alice Springs Orogeny and Hunter-Bowen fold systems. Regional fault systems tied to transpressional and extensional events described in studies from the Geological Survey of Queensland and Australian Academy of Science influenced accommodation space. Stratigraphic relationships include unconformable contacts with underlying Neoproterozoic metasediments mapped by Geoscience Australia and overlying Plio-Pleistocene alluvium recognized in Quaternary studies by the University of Sydney and University of Melbourne.
The Murraba Formation comprises interbedded arkosic sandstone, feldspathic siltstone, carbonaceous shale, pebble conglomerate, and laterally extensive coal seams reported in surveys by the Department of Mines and Petroleum. Sedimentary facies models articulated by researchers at the University of Western Australia and Curtin University emphasize channelized sand bodies, crevasse-splay heterolithics, and lacustrine mudstones analogous to sequences in the Murray Basin and Bowen Basin. Measured sections published by the Geological Survey of Western Australia enumerate composite thicknesses, bounding surfaces, and marker beds used for correlation with lithostratigraphic units catalogued by the Australian Stratigraphic Names Database.
Biostratigraphic and chronostratigraphic work constrains the Murraba Formation to the Neogene, with palynological zonations and vertebrate assemblage comparisons aligning to Miocene–Pliocene intervals used by paleontologists at the University of New South Wales and Macquarie University. Radiometric dates derived from interbedded volcanic tuffs, analyzed with argon–argon methods at the Australian National University and Geoscience Australia laboratories, provide absolute age anchors consistent with magnetostratigraphic polarity sequences correlated to the Geomagnetic Polarity Time Scale employed by researchers at the Scripps Institution of Oceanography and Lamont-Doherty Earth Observatory.
Fossil content includes marsupial remains, monotreme fragments, crocodilian teeth, freshwater bivalves, ostracods, and diverse palynomorphs collected during surveys conducted by the Queensland Museum, Western Australian Museum, and Museum Victoria. Comparative studies reference taxa in faunal lists curated by the Natural History Museum (London), Smithsonian Institution, and American Museum of Natural History, enabling biogeographic links with assemblages from the Riversleigh World Heritage site, Alcoota Local Fauna, and Cooper Creek localities. Plant macrofossils and pollen analyses conducted by botanists at CSIRO and University of Adelaide inform palaeoclimate reconstructions paralleling work on Miocene floras in New Zealand by Victoria University of Wellington and University of Otago.
Sedimentological interpretations attribute deposition to anastomosing fluvial systems, shallow lacustrine basins, and marginal deltaic plains influenced by climatic oscillations and hinterland uplift documented in tectonic syntheses from the Australian Academy of Science and Geological Society of Australia. Facies analysis by teams at Monash University and James Cook University invokes seasonal discharge regimes, floodplain coal formation comparable to sequences in the Surat Basin, and episodes of terminal lake expansion analogous to palaeolake systems described by researchers at the University of California, Riverside, and University of Texas.
The Murraba Formation hosts resources of economic interest including marginal coal seams, potential unconventional hydrocarbon source rocks, groundwater aquifers exploited by regional water authorities, and placer mineral concentrations investigated by mineral exploration companies and state departments such as the Department of Mines and Petroleum. Resource assessments conducted with input from CSIRO, Geoscience Australia, and private sector partners evaluate petroleum potential using analogs from the Eromanga Basin, Bowen Basin, and Cooper Basin, while conservation agencies and the National Trust consider aspects of palaeontological heritage and land use planning.