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La estratigrafa del cretacico superior y terciario en el extremo S del valle medio del Magdalena



La estratigrafa del cretacico superior y terciario en el extremo S del valle medio del Magdalena



Boletin de Geologia 19: 5-50



This is a comprehensive report on the Cretaceous and Tertiary stratigraphy of the middle Magdalena valley of Colombia. In the Girardot-Guataqu area the upper Cretaceous is composed of the Hondita formation, Loma Gorda formation, Olini group, and La Tabla formation. These beds are correlated with the Cimarrona formation along the Cordillera Oriental. The Tertiary, clastic nonmarine sediments are more difficult to correlate. In the Jerusalen-Guaduas syncline, the Tertiary sequence from oldest to youngest is the Sica formation, Hoyon formation, San Juan de Ro Seco formation, and Santa Teresa formation. In the middle Magdalena valley the Tertiary sequence is: the Cambras formation, San Antonio formation, Los Limones formation, and the Mesa formation. Many of the formational names used are introduced for the first time and supplant older, well known terms. The Quaternary is represented by a series of alluvial cones which issue from the Cordillera Central to the west; some extend to the Magdalena river. The structure of the valley is briefly considered.

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