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| Archeologist Glenna Dean points to the orginal base of a mesquite tree, which sticks up some three feet above the modern ground surface near Landergin Mesa. Long-term drought and overgrazing has caused massive erosion during the last century alone in some areas of the Texas Panhandle. Drought cycles plagued the Plains villagers as well, although they did not have to cope with overgrazing; in dry periods bison moved elsewhere or died off. Photo by Chris Lintz. |