VOLUMEN 13, NÚMERO 27 (1979)

FAUNA DE MOLUSCOS DEL PALEOCENO DE COLOMBIA. Etayo Serna, FEL GÉNERO VEATCHIA MAUR 1912 Y SU VALOR PALEOBIOGEOGRÁFICO. Etayo Serna, F

VOLUMEN 13, NÚMERO 27 (1979)

FAUNA DE MOLUSCOS DEL PALEOCENO DE COLOMBIA. Etayo Serna, FEL GÉNERO VEATCHIA MAUR 1912 Y SU VALOR PALEOBIOGEOGRÁFICO. Etayo Serna, F

Contributions of José Royo y Gómez to the knowledge of Cretaceous, Tertiary and Quaternary marine deposits of Colombia

The careful stratigraphic observations and sound paleontology of Dr. José Royo y Gómez about the Barremian of Colombia enabled him to stress the mediterranean affinities of that paleofauna. He was the pioner examiner of the effects of the Quaternary sea-level fluctuactions on the Caribbean coast of Colombi

José Royo y Gómez and the researches about the fossiI vertebrates of Colombia

Dr. José Royp y Gómez reached Colombia in 1939; at that time he combined solid field and paleontologic experience which enable him to start a whole new field, that is the analysis of the stratigraphic development of northern South America . Soon after arriving at Bogotá, Dr. Royo y Gómez began the organization of the Museo Geológico; in recognition of this fundamental contribution to the scientific culture of Colombia , this museum bears his nam

Paleomagnetism in Mesozoic rocks of the Northern Andes and its implications in Mesozoic tectonics of northwestern South America

New paleomagnetic data isolated in Upper Triassic to Aptian rocks exposed in the Colombian Andes and west of the Guyana craton, in conjunction with paleomagnetic data from the Andes of Venezuela and the South American craton, permit the interpretation of along-margin northward translations of Andean Colombian terranes during the Early-Middle Jurassic. Field tests and comparison with reference paleopoles for South America indicate that characteristic components uncovered in red-siliciclastic and igneous rocks are primary, or near-depositional, and they are carried dominantly by hematite, magnetite and Ti-magnetite. Difference in declination values of characteristic components isolated in fault-bounded blocks document counter-clockwise rotations previous to syn-extensional deposition. The Jurassic tectonic scheme proposed here for the northwestern corner of South America shows an Early Jurassic, linear subduction-related magmatic arc evolving to Late Jurassic rift-related setting associated to the opening of the Proto-Caribbean Ocean and westward retreat of the subduction zone. A similar tectonic evolution for the Jurassic has been proposed for Southwestern USA and the Nazas arc in Mexico.Fil: Bayona, Germán. Corporacion Geológica ARES; ColombiaFil: Rapalini, Augusto Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; ArgentinaFil: Costanzo-Alvarez, Vincenzo. Universidad Simón Bolívar; Venezuel