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#flint #chert #geology #sediment #science #silica #fracture #research #arrowhead #gunflint #the earth story #texas #amarillo #national monument

#flint #national monument #alibates flint #science #geology #dolomite #texas #archaeology #anthropology #gunflint #erosion #the earth story

#flint #national monument #alibates flint #science #geology #dolomite #texas #archaeology #anthropology #gunflint #erosion #the earth story