Los foraminíferos de la formación umir (sección quebrada la julia): registro del cretácico superior cuspidal (maastrichtiano) en el valle medio del magdalena, colombia

A very prolific association of foraminifera, represented by 17 different species between benthonic and planktonic forms, has been identificed by a detailed analysis of the Umir Formation (La Julia Creek Section, Middle Magdalena Valley). The presence of Ammobaculites colombianus Cushman and Hedberg...