In the Late Period IV (ca. 300 – 500 A.D.) a ceramic type called Guinea Incised was spread in the area of the Tempisque Basin. Some examples display human figures arrayed as bats, or are costumed as alligators. They are often interpreted as shamans/shamanesses impersonating powerful animals of the tropical forest. The painting shows a alligator shamaness in the caverns of Barra Honda, Tempisque Basin, Guanacaste, which today is a National Park. The prototype of the mask can be seen on a pedestal bowl done in the Guinea Incised style, and also on zoomorphic vessels from Nosara. Jade jewelry like the bar pectoral was the result of trade with the Maya region. Quantities of jade material were imported from the Motagua valley, Guatemala, and, as we know so far, there were several routes from Guatemala to Costa Rica.