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Leslie Harlacker<br />

Group Means, Core Metric Attributes<br />

Novice Intermediate Advanced <br />

Original % cortex 89.8 88.6 83.6 .136<br />

Original # scars 1.9 2.3 2.2 .720<br />

Original MD 127.6 132.4 126.0 .341<br />

Max. dimension 122.6 124.9 111.7 .003*<br />

Length 120.3 123.8 110.6 .006*<br />

Breadth 87.3 86.1 83.5 .541<br />

Thickness 52.2 54.6 50.1 .277<br />

Th:Br .62 .64 .61 .570<br />

Th:L .44 .45 .46 .880<br />

Br:L .74 .71 .76 .221<br />

Percent cortex 85 77 61 .000*<br />

Flake scars 4.5 5.2 6.2 .031*<br />

Scars from subject 2.5 3.0 4.1 .010*<br />

Edge angle 80 80 75 .095<br />

Edge length 79.8 69.8 73.6 .490<br />

Number of edges .38 .50 .71 .051*<br />

MDLS 51.1 61.8 74.6 .000*<br />

MDLS from subj. 47.8 60.2 73.4 .000*<br />

MDLS:Length .43 .51 .69 .000*<br />

MDLSsubj:L .41 .50 .68 .000*<br />

4.8 5.9 9.2 .016*<br />

Original weight 692 801 744 .096<br />

646 697 540 .012*<br />

<br />

<br />

<br />

degree of reduction. Maximum dimension, length, percent cortex, number<br />

<br />

reduced; more tangentially, the relative and absolute largest scar dimensions<br />

do as well. The means quoted in Fig. 4 indicate that in general, more experi<br />

enced knappers tend to produce lighter cores with smaller linear dimensions,<br />

<br />

230

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