Turrialba, a multicomponent quarry and manufacturing site in eastern Costa Rica, has yielded in surface collections 18 fluted points, fragments, and preforms. Both North and South American paleo-Indian point types are represented. Also present are keeled scrapers, end scrapers with lateral spurs, large flake side scrapers, burins, knives, and large blades. Turrialba is as yet undated, but future excavations at the site will be crucial in understanding the diffusion and development of the fluted point tradition in the Americas.

Although the eastern lowlands of Costa Rica have seen little scientific archaeology, recent stratigraphic test excavations have outlined a ceramic sequence of almost 1,500 years in the region. The earliest ceramic complex in this sequence, El Bosque, has been radiocarbon dated to the first few centuries after Christ. Stylistically, the El Bosque complex resembles material from contemporary periods in adjacent regions (Zoned Bichrome, Aguas Buenas), but also shares many ceramic modes with the Colombian site of Momil. A carbonized maize cob from an El Bosque midden is eight-rowed Pollo, an ancient race of South American maize. Evidence is presented supporting the hypothesis that aboriginal cultural traditions in eastern Costa Rica were basically part of a northern South American tropical forest pattern.