Crossing the Borders: New Methods and Techniques in the Study of Archaeological Materials from the Caribbean

Geochemical Techniques in Discriminating Chert Materials / 49
Figure 4.4. Geological map of the southwestern part of Puerto Rico showing the location
of chert sources in white (geological map based on Volckmann 1984a, b).
line of Antigua, similar tabular chert occurs in primary context in clayey deposits
and in a secondary context as subrecent marine erosion products along the beach.
They are gray- brown colored, fossil rich, dirty, and often contain large amounts of
carbonate, clay minerals, and opaque (organic) matter, resembling the flint of the
Antigua Formation.
Finally, the last investigated chert source on Antigua is the Shirley Heights lo-
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