page_title: Nappe
section_title: Structure
hierarchical_section_title: Nappe / Structure
caption_attribution_description: English: Vápeč Hill (955 m), Strážovské vrchy Mountains, District Ilava, Slovakia. Highest part of the hill is composed of triassic Wetterstein Limestone of Nedzov/Vererlín Nappe - Nappe outlier of Hronicum. Slovenčina: Vápeč (955 m n.m.), Strážovské vrchy, Okres Ilava, Slovensko. Vrchol tvorený svetlými triasovými wattersteinskými vápencami nedzovského/veterníckeho príkrovu - príkrovoá troska hronika.
context_page_description: In geology, a nappe or thrust sheet is a large sheetlike body of rock that has been moved more than 2 km or 5 km 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 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.
  The term stems from the French word for tablecloth in allusion to a rumpled tablecloth being pushed across a table.
context_section_description: Nappe can be qualified in a number of ways to indicate various features of a formation. The frontal part in the direction of movement, is called the leading edge of a nappe; numerous folds and secondary thrusts and duplexes are common features here and are sometimes called digitations. The surface of a thrust fault which caused movement of a nappe is called a decollement, detachment plane or sole of thrust. The root area is an area where the nappe is completely separated from its substratum. It is often compressed and reduced, even underthrust below the surrounding tectonic units, resulting in a specific structure called a suture. A nappe whose root area is unknown, is called a rootless nappe.
  Areas with a nappe structure often contain two types of geological features:
  A nappe outlier or klippe is a small area isolated from the main body of the nappe by erosion that lies on the autochthonous base; the summit of Veľký Rozsutec in the Western Carpathians is a typical example.
  A fault inlier, fenster, or window is an area of the autochthonous basement uncovered by erosion, but entirely surrounded by the body of the nappe; the Hohe Tauern window in the Alps is a typical example.
caption: Klippe of Hronicum nappe, Vápeč, Strážovské vrchy Mts., Slovakia
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