The surface geology of NSW, including the type, location and age of rocks and deposits, and geological boundaries. 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. This data has undergone substantial simplification and harmonisation both for display at 1:1 500 000 scale and to reconcile nomenclature and mapping mis-matches across the borders of its map tiles and jurisdictional boundaries. Due to the substantial simplification and generalisation which has occurred during editing, it is not recommended that the map or data be used at scales smaller than 1:1 500 000. For more detailed studies, the user is referred to the Geological Survey of New South Wales 1:250 000, 1:100 000 and 1:25 000 scale series geological maps.