Nappe

In geology, a nappe is a large sheetlike body of rock that has been moved more than 2 km (1.2 mi) or 5 km from its original position. Nappes form during continental plate collisions, when folds are sheared so much that they fold back over on themselves and break apart. The resulting structure is a large-scale recumbent fold. The term stems from the French word for tablecloth.