Abstract
Thrust system models which consider the observed variation in structural geometry from minimum displacement regions to maximum displacement regions to be equivalent to the temporal variation in structural geometry for any cross section through the thrust sheet are incompatible with observations of lateral variations in ramp angles and fold geometry in well-exposed thrust systems in Wyoming and Tennessee. The self-similar model of thrust system evolution assumes ductile bead strain is always accommodated by tip-line folding, and suggests that variations in structural geometry observed anywhere in the thrust system are the product of the continued deformation of currently observed lateral tip structures. These variations, however, are interpreted to reflect the influence of the intrinsic physical properties of the thrust system on thrust propagation. Rather than representing the progressive deformation of tip folds, the structural geometry of many thrust systems is most likely indicative of spatial and/or temporal variations in these intrinsic properties.
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