A movement causing the formation of a reverse fault of a very low angle. The thrust plane is the low-angle fault face over which movement occurs. Rubin et al. (2001) Eos 82, 47 write on Taiwanese thrust faults. A thrust belt is a geological formation caused by compressional tectonics, which ultimately results in the formation of large mountain ranges. The Patagonian fold and thrust belt is an example (Suarez et al. (2000) Geol. Mag. 137, 4). Kwon and Mitra (2004) Geology 32, 7 present a model of a fold-thrust belt wedge. Thrust belts present enormous potential for tapping into oil and gas deposits; see Johnson et al. (2007) The Leading Edge 26, 2.