Namoi BA geological model

## **Abstract** \n\nThese are the rasters that were developed from the source datasets (the Namoi leapfrog model from CDM Smith, the GAB Atlas and GABWRA) to create maps of the extent and thickness of the layers in the Namoi BA geological model. The maps and discussion of the data is presented in Product 2.1.2 for the Namoi subregion.\n\n## **Dataset History** \n\nThese are the rasters that were developed from the source datasets (the Namoi leapfrog model from CDM Smith, the GAB Atlas and GABWRA) to create maps of the extent and thickness of the model layers. The layers were created in the following way:\n\nThe Rolling Downs Group layer was extracted from the GABATLAS Rolling Downs Aquitard - thickness and extent. \n\nThe Pilliga Sandstone layer in the GAB was extracted from the GABATLAS Cadna-owie-Hooray Aquifer and Equivalents - Thickness and Extent. The Pilliga Sandstone in the Oxley (Gunnedah) Basin was extracted from the Namoi Leapfrog geological model.\n\nThe Purlawaugh Formation and Garrawilla Volcanics layer in the GAB was calculated using Layer 10 Great Artesian Basin base of Jurassic-Cretaceous sequence surface (GABWRA) and Layer 05 Great Artesian Basin base of Hooray Sandstone and equivalents surface (GABWRA). The Purlawaugh Formation and Garrawilla Volcanics in the Oxley (Gunnedah) Basin was extracted from the Namoi Leapfrog geological model.\n\nThe Interburden 1 layer was extracted from the Namoi Leapfrog geological model and combined the source layers of the Deriah and Napperby Formation, the Digby Formation and the Black Jack group above the Hoskissons Coal layer (layers 7, 8 and 9 in Namoi Leapfrog geological model).\n\nThe Hoskissons Coal layer was extracted directly from the Namoi Leapfrog geological model (layer 10 in the Namoi Leapfrog geological model).\n\nThe Interburden 2 layer was extracted from the Namoi Leapfrog geological model and combined the source layers of the Black Jack Group below the Hoskissons coal and the Millie Group (Watermark and Porcupine formations) (layers 11 and 12 in Namoi Leapfrog geological model).\n\nThe Maules Creek Formation layer was extracted directly from the Namoi Leapfrog geological model (layer 13 in the Namoi Leapfrog geological model).\n\n## **Dataset Citation** \n\nBioregional Assessment Programme (2017) Namoi BA geological model. Bioregional Assessment Derived Dataset. Viewed 10 December 2018, http://data.bioregionalassessments.gov.au/dataset/e7e08a78-d57e-4ad0-8ce2-ce9876ff899f.\n\n## **Dataset Ancestors** \n\n* **Derived From** [GABATLAS - Cadna-owie-Hooray Aquifer and Equivalents - Thickness and Extent](https://data.gov.au/data/dataset/bc55589c-1c6f-47ba-a1ac-f81b0151c630)\n\n* **Derived From** [GABATLAS - Rolling Downs Aquitard - Thickness and Extent](https://data.gov.au/data/dataset/0c4f0e0e-2d1d-4dee-9a57-36ecdd1d9a1f)\n\n* **Derived From** [Namoi Leapfrog geological model](https://data.gov.au/data/dataset/26747362-8e20-49df-ab2c-918fba839aa4)\n\n* **Derived From** [Layer 05 Great Artesian Basin base of Hooray Sandstone and equivalents surface (GABWRA)](https://data.gov.au/data/dataset/e7d89c74-81fd-457d-baae-03ed44f1b4dd)\n\n* **Derived From** [Layer 10 Great Artesian Basin base of Jurassic-Cretaceous sequence surface (Great Artesian Basin Water Resource Assessment)](https://data.gov.au/data/dataset/11dcfa96-2a3e-402d-b6f2-1e90290842f7)\n\n