In both of these photos, bones are being broken for marrow. (A) The bone is being struck against a rock, referred to as batting, (B) the bone is being struck by a stone tool called a hammerstone. Pictured on the left is Gabriella Brisa Yezzi-Woodley. Pictured on the right is T.J. Palli. Photo courtesy of Katrina Yezzi-Woodley.