Griman Creek Formation
Geological formation in Australia / From Wikipedia, the free encyclopedia
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Not to be confused with Gorman Creek Formation.
The Griman Creek Formation is a geological formation in northern New South Wales and southern Queensland, Australia whose strata date back to the Albian-Cenomanian stages of the mid-Cretaceous.[1] It is most notable being a major source of opal, found near the town of Lightning Ridge, New South Wales. Alongside the opal opalised fossils are also found, including those of dinosaurs and primitive monotremes.[2]
Quick Facts Type, Unit of ...
Griman Creek Formation | |
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Stratigraphic range: late Albian-early-mid Cenomanian ~106–98 Ma | |
Type | Geological formation |
Unit of | Rolling Downs Group |
Sub-units | Coocoran Claystone & Wallangulla Sandstone Members |
Underlies | Unconformity with Oligo-Miocene Cumborah Gravel |
Overlies | Surat Siltstone, Wallumbilla Formation |
Thickness | Up to 345 m (1,132 ft) |
Lithology | |
Primary | Sandstone, siltstone, mudstone |
Other | Conglomerate, coal |
Location | |
Coordinates | 29.4°S 147.7°E / -29.4; 147.7 |
Approximate paleocoordinates | 64.4°S 134.9°E / -64.4; 134.9 |
Region | Queensland New South Wales |
Country | Australia |
Extent | Surat Basin |
Type section | |
Named for | Griman Creek |
Named by | Reiser |
Year defined | 1970 |
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