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Geological Society, London, Special Publications; 1981; v. 9; p. 7-9;
DOI: 10.1144/GSL.SP.1981.009.01.02
© 1981 Geological Society of London

What is a Thrust? What is a Nappe?

J. G. Dennis, R. A. Price, J. K. Sales, R. Hatcher, A. W. Bally, W. J. Perry, H. P. Laubscher, R. E. Williams, D. Elliott, D. K. Norris, D. W. Hutton, T. Emmett & K. R. McClay

The definitions of thrusts and nappes are discussed and the criteria used to define these structures are analysed. A ‘thrust fault’ is defined as a map-scale contraction fault. A ‘thrust nappe’ is an allochthonous tectonic sheet which has moved along a thrust fault. Suggested definitions are also given for, a fold nappe; extension fault; contraction fault; listric normal fault; reverse listric fault; klippe; tectonic slide; ramps and flats; duplex structure; blind thrusts.