Obsidian: Production debris. Top row, core fragments (Op 1, Z 1b and Op 10, Z 3a). Bottom row, two groupings of flakes. On left is Ixtepeque obsidian (Op 8, Z 1), and on right is El Chayal obsidian (Op 12, Z 1). OB# 011, OB# 085, OB# 109, and OB# 135.
