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As a preliminary study, the primary objective to this investigation is to provide insight into the paste composition of two ceramic types—Usulutan and Rosales Zone Engraved—from the sites of Loma Corral 3 (G-776 LC3) and Manzanillo (G-430 MZ) in the Bay of Culebra, Guanacaste. Petrographic analysis of Usulutan and Rosales Zone Engraved ceramics from the Tempisque period (300 B.C.–500 A.D.) suggest that groups in the Bay of Culebra were participating in exchange of ceramics and ceramic techniques. Most recent investigations have demonstrated that Usulutan was manufactured in Nicaragua, although it is still unclear as to whether or not it was also manufactured in Costa Rica

Petrographic analysis of Usulután and Rosales Zone Engraved ceramics from two Tempisque period (300 B.C. - 500 A.D.) sites on Culebra Bay, Costa Rica