Abstract:On many Navajo Sandstone outcrops in southern Utah, steep, decimetre-high scarps (downslope-facing margins of rock sheets) interrupt smooth slopes covered by crustose lichens. Scarps form where sheeting joints and water emerge at the land surface.Weathering at scarp faces causes upslope backwasting of rock sheets and leaves behind smooth, unweathered rock surfaces that become stabilized by lichens. We hypothesize that subsurface, low-angle, open fractures in porous and permeable rocks are barriers to downward … Show more
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