Table 2.

Morphology of maize starch grains recovered from the Xihuatoxtla stone tools

Provenience	Tool Cat. no.	Shape				Hilum cavity	Compression Facets		Fissures
		Round	Oval	Bell	Irregular		Slight	Defined	Transverse	Total with fissures	n
Unit 1
Ceramic
Layer B	310a	0	17	0	83	0	33	67	17	67	6
	312a	0	0	0	100	0	100	0	100	100	1
Layer C	314c	46	0	0	54	46	73	27	0	18	11
	315c	11	0	0	89	11	44	56	33	77	18
Preceramic
Layer D	316c	0	0	0	100	100	50	50	0	50	2
	316d	9	0	3	88	19	26	74	23	46	68
Layer E	318e	13	1	0	86	35	19	81	25	61	80
	318d	5	0	0	90	18	9	91	41	74	22
	319d	12	0	0	88	12	38	62	0	50	8
	322c	9	0	0	91	9	27	73	36	72	11
Unit 2
Ceramic
Layer B	361a	33	0	0	67	33	33	67	0	67	3
	362a	25	0	0	75	5	38	62	12	37	8
	364a	0	0	0	100	0	33	67	64	64	3
	365	50	0	0	50	0	50	50	50	50	2
Layer C	365a	4	0	0	96	42	33	67	32	64	25
	365b	0	0	0	100	0	20	80	40	60	5
	366a	50	0	0	50	0	50	50	50	100	2
Preceramic
Layer D	367a	44	0	0	56	11	78	22	0	33	9
	368a	0	0	0	100	33	0	100	33	99	3
Scrapers
Unit 1
Ceramic (B)	308	0	0	0	100	0	0	100	100	100	1
Preceramic	322	0	0	0	100	25	25	75	0	25	4
Unit 2
Preceramic	370	0	0	0	100	25	12	88	25	75	8

n, total number of grains present on each tool. The numbers represent the percentages of each attribute present in the starch grain assemblages. See Table S2 for the same analysis of modern varieties of teosinte and Mexican maize.