Table 2.

Results of cross-striation measurements on a sample of ten modern human molars compared with mean values (µm, ± SD) of Paranthropus robustus and Australopithecus africanus measured using the same scheme described in the text. Modern humans show much lower rates than both hominid taxa

	Cusp. out	Cusp. mid	Cusp. Inn	Lat. out	Lat. mid.	Lat. Inn	Cerv. out	Cerv. inn
H. sapiens	5.20 ± 0.58 (10)	4.50 ± 0.55 (10)	2.80 ± 0.43 (10)	4.80 ± 0.67 (10)	4.30 ± 0.5 (10)	2.70 ± 0.42 (10)	3.60 ± 0.44 (9)	2.60 ± 0.44 (10)
P. robustus	7.25 ± 0.44 (5)	6.12 ± 0.56 (4)	4.16 (1)	6.59 ± 0.28 (5)	5.63 ± 0.27 (5)	3.95 ± 0.25 (2)	4.83 ± 0.26 (7)	3.89 ± 0.02 (3)
A. africanus	6.62 ± 0.55 (5)	5.80 ± 0.30 (4)	4.18 ± 0.75 (2)	6.11 ± 0.37 (6)	5.25 ± 0.39 (5)	4.20 (2)	4.46 ± 0.22 (4)	3.74 ± 0.29 (4)

The number in parentheses is the number of teeth included in each category for each taxon.