World Map of Carbonate Rock Outcrops v3.0
This Dataset contains shapefiles showing the occurence of carbonate rocks on a world map. These shapefiles are projected in WGS84. There is one shapefile showing the relatively continous carbonates and another one indicating rather abundant but not continous carbonates.
Source: http://web.env.auckland.ac.nz/our_research/karst/#karst6