210 THE FLORIDA ANTHROPOLOGIST

2006 VOL. 59(3-4)

LO

Explanation

Pumice Artifact Sites

e Analyzed Sites

Other Sites

200 Kilometers

100 150 Miles

 

Figure 1. Location of pumice artifacts selected for petrographic and geochemical analyses. The Miami Circle, Brickell Point,
and Granada location symbols overlap at the scale of this map. Pumice location map modified from Wheeler (2006). Symbols -
Brickell Point - BP, Bear Lake 1 -BL, Custom House - CH, Dearing Estate - DE, Fort Center - FC, Granada - GR, Higgs Site -
HG, Indian Key - IK, Miami - Circle - MC, Shark Butchery - SB, Sutton Site - ST, Whitebelt 1 - WB, Wynnhaven Beach - WH.

then mounting the impregnated chip onto a glass thin section
blank, then grinding and polishing the thin section to a standard
thickness of 30 pm. Five to ten gram sample slabs were
crushed and split into two fractions. One fraction was sieved,
and the 185-210 jm size fraction was ultrasonically cleaned in
distilled water, air dried and then used for index of refraction
measurements. The other portion of the crushed sample was
pulverized to <300 mesh in preparation for geochemical
analyses.

Samples were prepared for geochemical analyses by heating
amixture of pulverized whole rock and lithium metaborate flux
in a graphite crucible at 1050° C for 15 minuets. The fluxing

procedure insures dissolution of refractory minerals such as
zircon. The flux bead was then dissolved into 100 ml of five
percent high purity nitric acid. The dissolved sample was split
into two solutions. One solution was diluted for major element
analyses. The second undiluted solution was used for trace
element analyses. Major element analyses were performed
using a Jarrel Ash Atom Comp Model 975 emission spectro-
graph. The accuracy of internal laboratory standard solutions,
used for calibration of the emission spectrography, was checked
against solutions prepared from United States Geological
Survey whole rock standards. The estimated precision for
major element analyses is one percent. Accuracy for major