Part of Speech: noun
Definition: a sheet-like layer of rock that has been moved by thrust faulting from its original position and is now overlying a younger rock layer
Pronunciations: US: /næp/; UK: /næp/
Origin and Usage: The word "nappe" originated from the French word "nappe" which means "tablecloth". It was first used in English in the late 19th century to describe a sheet of rock that had been thrust over another rock layer due to tectonic forces. The term is commonly used in geology to describe the structure of mountain ranges.
Synonyms: sheet, layer, slab, stratum
Related Words: fault, thrust, layer, shale, slate
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