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The Organization of Chipped-Stone Economies at Piedras Negras ...

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Figure 6.1: Exhausted obsidian blade-cores <strong>at</strong> <strong>Piedras</strong> <strong>Negras</strong>. Above: obsidian bladecore<br />

reduced by pressure on one or more sides, but not in the round (also notched as an<br />

eccentric); center: obsidian blade-core reduced by pressure in the round, or on all sides <strong>of</strong><br />

the core; below: very small pressure-blade cores reduced in the round. Drawings by<br />

Zachary X. Hruby.<br />

210

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