TABLE 3. Frequency of scratch marks and pits on a representative sample of teeth used in this study. DIP represents dentine incidence of pitting. EIP represents Enamel incidence of pitting. DIP and EIP expressed as percentages. Note the consistent pattern of higher incidence of pitting on the dentine surfaces. The open entries in the table reflect the dental surface was not preserved well enough to reliably discern features. Vector length refers to the length of the mean scratch vector and is a measure of the concentration of the orientations of the long axis of each scratch. More random distributions approach 0 and more preferred distributions approach 1 (see Ungar 1994, 2002).

	Specimen number	Geography	DIP	EIP	Vector Length
	DMNH 22143	Alaska	--	09	0.441
	DMNH 22142	Alaska	--	11	0.356
	DMNH 22141	Alaska	18	--	0.171
	TMM 42315-1D	Alberta	14	0	0.295
	TMM 42315-1B	Alberta	18	0	0.499
	TMM 40484-21A	Alberta	--	13	0.283
	DMNH 22160	Wyoming	17	--	0.398
	DMNH [Denver] 20378D	Wyoming	15	13	0.293
	TMM 43057-439D	Texas	17	--	0.397
	TMM 42335-68C	Texas	13	11	0.442