Karst 1 : A topography formed when groundwater forms pockets or caves below or in a structure (usually limestone), allowing some of that structure to drop (e.g., create sinkholes). The complete cycle occurs over geologic time
George E. King Engineering, 5000 Oilfield Terms: A Glossary of Petroleum Engineering Terms, Abbreviations and Acronyms, US 2010. http://gekengineering.com/Downloads/Free_Downloads /Glossary_of_Petroleum_Engineering_Terms_25_August _2010.pdf, (Oil - Amer) {593}