Abstract
The "causse of Laissac-Severac" is situated north of "Grands Causses" between " causse Comtal" and "causse of Sauveterre" (Aveyron ) in limestones and dolomites of Lias and Middle Jurassic. This speleological area pre¬ sents two kinds of karst systems : losses and resurgences on the border of the crystalline massif (Levezou ) on the south part (Clos del Pous -3 km), caves with numerous sumps under the "causse of Severac" on the north part (plateau with large depressions) (Tantayrou = 3,1 km). These caves are post-miocene because of the dated vol-canism ; they cut an eogene paleokarst which is characterized by ferralitic paleosoils (ferruginous sandstones called "Sidérolitique") from the alteration of crystalline massif.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
