1. nappe - Noun
2. nappe - Verb
Sheet; surface; all that portion of a surface that is continuous in such a way that it is possible to pass from any one point of the portion to any other point of the portion without leaving the surface. Thus, some hyperboloids have one nappe, and some have two.
Source: Webster's dictionaryAccording to geologist Stefan Schmid, because the Western Alps underwent a metamorphic event in the Cenozoic Era while the Austroalpine peaks underwent an event in the Cretaceous Period, the two areas show distinct differences in nappe formations. Source: Internet
Gustav Steinmann (1906) recognised different classes of orogenic belts, including the Alpine type orogenic belt, typified by a flysch and molasse geometry to the sediments; ophiolite sequences, tholeiitic basalts, and a nappe style fold structure. Source: Internet
The Alps are subdivided by different lithology (rock composition) and nappe structure according to the orogenic events that affected them. Source: Internet
In the cavity formed below the nappe, a local subpressure beneath the nappe is produced by which air is sucked into the flow. Source: Internet