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

The small stemmed biface type also differs from the small tanged biface, which
has shoulders that protrude beyond the line where the stem and body of the tool meet.
The stemmed biface can range in quality and may have been the result of a number of
different production trajectories. A stemmed biface can originate from a small tanged
biface with broken tangs, a small laurel leaf biface a preform, or a small celtiform biface
preform. The preforms were carefully notched at the base to produce the stem.
While the small stemmed biface is very common at Uaxactun and Altar de
Sacrificios, it is not common at Piedras Negras. The hafting preparation of choice at
Piedras Negras appears to be minor tapering at the base of a laurel leaf or celtiform
biface. The small stemmed biface is found throughout the lowlands during the Early and
Late Classic periods.
5.4.1.3.10: Small tapered biface (see Figure 5.2 #31; see Section 5.4.1.2.8 for
description).
5.4.1.3.11: Small straight-stemmed biface (see Figure 5.2 #32; see Section 5.4.1.2.9 for
description).
5.4.1.3.12: Small side-notched biface (see Figure 5.2 #33; see Section 5.4.1.2.10 for
description).
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