The study presents a combined sedimentological, micropaleontological and petrological approach to the Cretaceous sedimentary basement and cover sequences of the Costa Rican arc orogen. The findings show an evolved volcanic arc with explosive calc-alkaline volcanism, which was active since at least the Albian. This intraoceanic arc was built on the western Caribbean Plate boundary where the oceanic Farallon Plate was continuously subducting. Some evidence suggests that the subduction processes in southern Central America might have already begun in the Late Jurassic.
In dieser Zusammenfassung werden konkrete Hinweise auf Subduktionsprozesse während der Unterkreide in Südzentralamerika präsentiert. Somit bildete der entsprechende mittelamerikanische Inselbogen seitdem die westliche Grenze der Karibischen Platte.
