Nappe
（重定向自Recumbent fold）
![Schematic overview of an eroded thrust system. The shaded material is the nappe. The erosional hole is called a window or fenster. The klippe is the isolated block of the nappe overlying autochthonous material.](/Images/godic/202502/06/Thrust_system_en5045.jpg")
![Klippe of Choč nappe, Vápeč, Strážovské vrchy Mts., Slovakia](/Images/godic/202502/06/Vápeč_od_Horní_Poruby5045.jpg")
In geology, a nappe or thrust sheet is a large sheetlike body of rock that has been moved more than 2 km (1.2 mi) or 5 km (3.1 mi) above a thrust fault from its original position. Nappes form in compressional tectonic settings like continental collision zones or on the overriding plate in active subduction zones. Nappes form when a mass of rock is forced (or "thrust") over another rock mass, typically on a low angle fault plane. The resulting structure may include large-scale recumbent folds, shearing along the fault plane, imbricate thrust stacks, fensters and klippe.