Figure 52. Quadrangular adz, with tang (C.2742). a, front: edge narrows slightly owing to rounding off of corners; adz slightly concave longitudinally and flat transversely except for slight rounding off of well defined side edges (3); long flaw (4) along one of side edges; shoulder (2) flat and forms convex curve toward tang (5) formed by grinding away front of butt and rounding off front longitudinal edges; tang inclines backward at angle with blade and narrows toward poll, where it ends in two well shaped bilateral lugs (6,6) which come to rounded point with hollow between them. b, back: tang and blade surfaces continuous, concave longitudinally and slightly convex transversely owing to slight rounding off of back longitudinal edges (7); back narrower than front, and parts of lateral surfaces (9) may be seen; bevel (10) forms large surface, quadrilateral in shape, bounded above by straight chin (8), below by wide cutting edge, and at sides by well marked edges formed with lateral surfaces; bevel convex longitudinally and flat transversely, except near cutting edge where slightly concave. c, right side view: shoulder (2) and lugs (6) prominent; back has marked longitudinal concavity; poll (11) forms surface bounded by straight edge at back and concave edge in front due to contour of lugs; cutting edge well ground but blunt and shows no flaws or chips.