Artifacts

by Scott G. Ortman

Table 34. Cross-tabulation of Raw Material Grade vs. Number of Grinding Surfaces for Two-Hand Manos, Castle Rock Pueblo

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Raw Material Grade
Number of Grinding Surfaces
Total
One Surface
Two Adjacent Surfaces
Two Opposite Surfaces
Three Surfaces
Four Surfaces
Dakota quartzite
count
1
2
2
5
grade
20.0
40.0
40.0
100.0
surfaces
6.3
13.3
40.0
9.8
Fine-grained sandstone
count
1
1
2
1
5
grade
20.0
20.0
20.0
100.0
surfaces
6.3
11.1
13.3
16.7
9.8
Medium-grained sandstone
count
6
5
10
3
4
28
grade
21.4
17.9
35.7
10.7
14.3
100.0
surfaces
37.5
55.6
66.7
60.0
66.7
54.9
Conglomerate sandstone
count
8
3
1
1
13
grade
61.5
23.1
35.7
7.7
100.0
surfaces
50.0
33.3
6.7
16.7
25.5
TOTAL
count
16
9
15
5
6
51
grade
31.4
17.6
29.4
9.8
11.8
100.0
surfaces
100.0
100.0
100.0
100.0
100.0
100.0

NOTES: Grade = percent within grade; surfaces = percent within number of surfaces.

Chi-Square Test Results

Value
df
2-Tailed Significance
Pearson chi-square
16.675a
12
0.162
Likelihood ratio
17.965
12
0.117
No. of valid cases
51

a Eighteen cells (90.0%) have an expected count of less than five. The minimum expected count is .49. df = degrees of freedom.

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