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  "Title": "NSW 1500K Geology",
  "Author": "colquhog",
  "Comments": "Between 2003 and 2005, a team from Geoscience Australia (Liu et al. 2005) generalised the New South Wales geology dataset of Xie (2003) to produce a seamless 1:1 000 000 scale geology map of NSW. In addition, the team added provisional datasets from the Goulburn and Cargelligo 1:250 000 mapping project areas and 1:100 000 scale mapping from the Cobar and Nymagee 1:250 000 map sheet areas. Synthesis datasets from western New South Wales (Laing et al. 1996) and the Murray Basin region (Brown & Stephenson 1991) were also integrated (Figure 1). The Geoscience Australia team then produced a seamless state dataset by edge matching the various source datasets which often did not agree due to their widely varying ages and compilation scales. Adjustment of some of the older geological datasets was made using geophysical data interpretation, particularly where poor edge matching or spatial accuracy (± 1 km) was identified in the source data. Due to the 1:1 000 000 scale, many smaller units from the 1:250 000 source datasets were deleted, merged or enlarged.\n\nBetween 2006 and 2008, Gary Colquhoun (Geological Survey of New South Wales) performed substantial edits on the Geoscience Australia 1:1 million scale geology dataset with the aim of producing a New South Wales geology map at 1:1 500 000 scale. These edits comprised:\n\u2022\tSimplifying the geological unit symbology by changing from a stratigraphic unit-based code to an age-lithology code (see below for explanation).\n\u2022\tMerging many units as a result of this code simplification.\n\u2022\tDeleting, or merging many polygons which were too small for display at 1:1 500 000 scale.\n\u2022\tSubstantial generalisation of geological linework to reduce nodes for smoother display.\n\u2022\tSubdividing plutonic and volcanic rocks based on type (I-type, S-type, etc). These data were derived from a variety of sources, namely: Eastern Lachlan Orogen Geoscience database (Glen et al. 2006); NSW AMIRA geochemical database; and numerous unpublished geochemical datasets held by the Geological Survey of New South Wales.\n\u2022\tMany areas were reclassified to emphasise bedrock data rather than a thin veneer of regolith (eg. Qr/Ks was reclassified as Ks not Qc). This involved merging and simplifying many hundreds of rock unit polygons.\n\u2022\tMinor changes in stratigraphic nomenclature were made to make the data consistent with the Eastern Lachlan Orogen dataset (Glen et al. 2006).\n\u2022\tTo enable easier simplification to 1:1 500 000 scale, the original Cobar and Nymagee 1:250 000 metallogenic sheet data were added, replacing many 1:100 000 scale datasets added by Geoscience Australia in these areas. \n\u2022\tThe finalised Cargelligo 1:250 000 geology map (Meakin et al. 2006) was added and simplified. An updated preliminary Goulburn 1:250 000 geology map was also added and simplified.\n\n\nEXPLANATION OF GEOLOGICAL LETTER SYMBOLS USED ON THE MAP\n\nThe geological units of the map have been symbolised using a code to convey generalised age-lithology information about a geological unit.\n\n1st letter: the first letter indicates the geological period or era and is represented on the vertical column of the geology legend (eg. P = Permian; D = Devonian; O = Ordovician, etc.). Note that some geological periods or eras use 2 letters (eg. Cz = Cainozoic) and can have a letter different to the initial letter of the period due to some periods sharing the same initial letter (eg. E = Cambrian; K = Cretaceous).\n2nd letter: the second letter represents the type of rocks in the unit and relates to the top row of headings on the geology legend (eg. Cs = Carboniferous sedimentary rocks; Sm = Silurian mafic intrusions). Note that mixed sedimentary and volcanic units use two letters and have been annotated \u201csv\u201d\n3rd letter: the third letter generally subdivides the igneous rocks into I-type, S-type, A-type or undifferentiated (e.g. Dvi = Devonian volcanics I-type; Sgs = Silurian granite S-type).\n\nCREDITS\n\nBibliographical reference: GEOLOGICAL SURVEY OF NEW SOUTH WALES. 2009.New South Wales 1:1 500 000 Geology Map. First edition. Geological Survey of New South Wales, Department of Primary Industries, Maitland, NSW, Australia.\n\nGeology compiled and edited by J. Xie,, G.P. Colquhoun (Geological Survey of New South Wales) O.L. Raymond, S.F.Liu, A.J. Retter, D. Phillips, A. Kernich, D.S. Percival, C. Macgregor(Geoscience Australia).\n\nExplanatory text by G.P. Colquhoun.\n\nTechnical editing by: J. Greenfield, P. Blevin, J. Stroud, D. Pogson.\n\nCartography by: W. Zhang, L. Mills, L. Li.\nTopographic base map data were compiled and extensively edited by L. Mills from digital data supplied by Geoscience Australia, Canberra.\n\nFront cover photograph by D. Barnes\n\nPrinted by Department of Lands. Panorama Avenue, Bathurst, New South Wales\n\nPublished by Department of Primary Industries 2009\n",
  "Subject": "The New South Wales 1:1 500 000 scale geology map represents an up-to-date synthesis of the surface geology of the state. The map has been compiled principally from 1:250 000 scale geological map data from the Geological Survey of New South Wales.",
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  "TextAntialiasingMode": "Force",
  "Keywords": "NSW_1500K_Surface_Geology"
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