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| Small bison herd grazing in Texas Panhandle. As first documented by archeologist Tom Dillehay in the 1970s, the archeological record of Texas and the Southern Plains documents the cyclical presence-absence of bison remains in archeological sites in the region. These cycles appear to be linked to major climatic cycles with wetter/cooler periods favoring the expansion of grasslands and bison. Image courtesy Texas Parks and Wildlife. |