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PUMICE ARTIFACTS FROM THE MIAMI CIRCLE 195

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Figure3. Examples of different pumice textures: a) tube pumice (MDC.1.471.6b); b) grainy (MDC.1.222.11a); c) popeorn-like
(HMSF 427.5, Customs House site 8DA1064); d) spongy (MDC.1.222.11c); e) dense and chalky (FBAR 72.20.534.1, Indian

Key 8MO1S5). All from Miami Circle, except c and e.

average length is 4.2 cm. The distribution of pumice size
classes (by length) follows a bell curve, with the most clasts in
the 2.1-4.0 and 4.1-6.0 cm categories. Most of the pumice
artifacts from other sites have similar dimensions, though one
example from Ft. Center (8GL13) is quite large, measuring 16.7
cm in length.

Weight

All specimens were weighed, in grams, with an electronic

balance. Overall, 1,789 g of pumice was recovered from the
Miami Circle excavations. Specimens ranged in weight from
0.4 g to 116.3 g, averaging 14.8 g (Figure 6). The weight
distribution of pumice clasts is skewed toward to lower weight
classes. One exceptional example from Ft. Center (8GL13),
mentioned above, is 484.9 g.

Shape: Roundness

Standards of roundness and sphericity are presented by