Abauntz fig 1

Figure 1. Block 1: Volumetric representation. Side A is divided into two planes (I and II) by an edge and a flaked-border in its left part (a); a small natural hole is present in Plane II (b). Side B is divided into three planes (I, II, and III); Plane I has a natural concavity with an ellipsoidal spiral (a), and Plane II has three small flaked-shape borders (b–d).