Archaeologist Carolyn Boyd studies a drawing in Panther Cave in Seminole Canyon State Park, Comstock, Texas. (AP Photo/Michael Graczyk)
AP Photo/Michael Graczyk)
Archaeologist Carolyn Boyd studies a drawing in Panther Cave in Seminole Canyon State Park, Comstock, Texas. (AP Photo/Michael Graczyk)
AP Photo/Michael Graczyk)