nappe

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nappe

 (năp)
n.
1. A sheet of water flowing over a dam or similar structure.
2. Geology A large sheetlike body of rock that has been moved far from its original position.
3. Mathematics Either of the two parts into which a cone is divided by the vertex.

[French, tablecloth, nappe, from Old French, tablecloth, from Latin mappa, napkin; see map.]

nappe

(næp)
n
1. (Geological Science) a large sheet or mass of rock, commonly a recumbent fold, that has been thrust from its original position by earth movements
2. the sheet of water that flows over a dam or weir
3. (Mathematics) geometry either of the two parts into which a cone (sense 2) is divided by the vertex
[C20: from French: tablecloth]

nappe

(næp)

n.
Geom. one of the two equal sections of a cone.
[1905–10; < French: literally, tablecloth; Old French nappe, nape < Latin mappa]

nappe


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A recumbent (flopped over) fold that has sheared through, with its upper limb forced far forward.
References in periodicals archive ?
Tenders are invited for Supply of Crystallographic Model, Wooden Cabinet, Axis of symmetrical of 6 System, Collection of Minerals, Hardness Testing Knife, Model Showing Strike, Dip, Pitch, soclinals Anticline & Syncline, Recumbent Fold, fan Foldfor Engineering Geology Lab in civil Engineering Department.
A series of intersecting cross sections combined into a fence diagram suggests that the layer of Swat gneiss forms a recumbent fold that extends about 8 km across the dome with southwest vergence.
Mapping and seismic reflection studies indicate that recumbent folds, thrust faults, and high-angle faults are more abundant than was shown by Osberg et al.
The recumbent folds verge in the opposite direction to the generally southward-verging orogen and may have been generated in response to top-to-the-north motion along the underlying South Tibetan detachment.
These structures include recumbent folds, breccia zones, extension veins, and normal faults, and occur at all sites exposing the Macumber Formation limestone.