Data identifying boundaries (shown as polylines) describing the contact between geological units at the margins of karstic dolines and sinkholes. The scale of the data is 1:10 000 scale. Coverage is provided for the main Maltese Islands. The data includes attribution to identify the local names, and postulated age of formation of the features (in varying levels of detail). Several modes of failure are represented by the doline/sinkholes, The boundaries therefore represent planes of structural failure or flexure. The data are available in vector format (containing the geometry of each feature linked to a database record describing their attributes) as ESRI shapefiles.
