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. 2007 Nov 21;104(49):19210–19213. doi: 10.1073/pnas.0707929104

Fig. 2.

Fig. 2.

The USO digging tools from Ugalla. (A) The stick tool specimens. The “working end” of each specimen is that to which sediment adheres (see Insets, showing sediment banked against callus rings of specimens). IS-S-001: weight = 18.5 g, length = 520 mm, circumference = 37 mm maximum/proximal and 20 mm distal. IS-S-002: weight = 26.5 g, length = 520 mm, circumference = 39 mm maximum/proximal and 25 mm distal. IS-S-003: weight = 45.5 g, length = 490 mm, circumference = 59 mm maximum/proximal and 34 mm distal. (B) The wood tool specimens. IS-W-001: weight = 33.6 g, length = 427 mm, maximum circumference = 62 mm. IS-W-002: weight = 33.6 g, length = 312 mm, maximum circumference = 56 mm. (Inset) Working end of IS-W-001, slightly rotated (arrow) from full-specimen view, showing a thick accumulation of sediment in a natural trough. (C) The bark tool specimens. The working end of each bark specimen is that portion that lacks macroscopically apparent layers of periderm in the edge-on view. For each specimen, angle and thickness measurements were taken at 1-cm intervals. Values on the figure represent means for the measured regions of each specimen. IS-B-001: weight = 44.0 g, length = 422 mm, maximum width = 80 mm (a small section of the working end is broken from the larger specimen and not pictured here). IS-B-002: weight = 23.7 g, length = 176 mm, maximum width = 77 mm.