Stone Replacement
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Masonry near the ground surface can be severely damaged by the effects of poor drainage and repeated freezing and thawing. When these damaged stones can no longer support the weight of the wall above them, they are replaced with stones of similar size, shape, color, and surface texture. Replacing a few eroded stones at the base of a wall will protect the upper second and third stories of the building. 
Wall with eroded mortar and missing stones in need of repair
NPS Photo
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Did You Know?
During the Late Cretaceous time, Chaco Canyon was at the edge of a large inland sea. Today we can find fossil clam shells, shark teeth, ammonites, and burrows of shrimp-like animals in the canyon rocks.