Explaining curvilinear forms such as these, which are by no means limited to the Navajo, remains a major task. This task is made difficult by the interaction of three broad sets of controls, one set being structural, the second being lithological, and the third being erosional. The difficulty is increased by the variation of the curved forms; these range from domes and smooth “slick rock” slopes, through alcoves, arches, and natural bridges, to horizontal recesses and amphitheatres. Variations in scale also must be considered, as small curved features, especially polygonal tesselation or “elephant hide”, are frequently superimposed on larger curved surfaces.
KeywordsFatigue Shale Flare Excavation Crest
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