The calas are mainly the result of the marine drowning of the fluvial valleys, often only leaving their head. Some of the calas are very influenced either by the fracture pattern or minor lines, but the most definitory feature comes from the karst revealed on canyons, dolines and collapses. The emerged carbonatic platforms are then the election places to the calas formation. We sholud not call them calas if the ratio stretch-inlet is less than 2 or 5. Other more precise morphometric indexes, are being tested.... [Leer más...]