Nappe

A body of rock, generally highly folded and with greater ductile deformation than a thrust sheet, which has suffered considerable horizontal tectonic transport in an orogenic belt.

A nappe is also known as a decke.

Nappe (?), n. [F. nappe cloth, sheet. See Napery.] Geom.

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.

 

© Webster 1913.