. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography Cordillera de la Costa on the north and the Serrania del Interior on the South. Summaries of the geology of the area west of Barcelona Bay are contained in the works of Bell (1967), Dengo (1953), Menendez (1962, 1967), Morgan (1967), and Oxburgh (1966). Sources used for the geology of the eastern region are Mencher et a_l. (1953) , Metz (1968a, 1968b) , Rod (1956, 1959), Rod and Maync (1954), Salvador and Stainforth (1968), Schubert (1971), and Von
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography Cordillera de la Costa on the north and the Serrania del Interior on the South. Summaries of the geology of the area west of Barcelona Bay are contained in the works of Bell (1967), Dengo (1953), Menendez (1962, 1967), Morgan (1967), and Oxburgh (1966). Sources used for the geology of the eastern region are Mencher et a_l. (1953) , Metz (1968a, 1968b) , Rod (1956, 1959), Rod and Maync (1954), Salvador and Stainforth (1968), Schubert (1971), and Von der Osten (1955, 1957). The geology of Cubagua, Margarita, and Tortuga is from Kugler (1957), Taylor (1960), and Maloney and Macsotay (1967), respectively. Bell (1967) distinguished eight tectonic belts in the Caribbean mountains west of the Bay of Barcelona (fig. 34). Although their ages are subject to debate, the basement rocks are considered pre-Mesozoic, and represented by the Sebastopol granitic gneiss complex and the Pena de Mora gneiss in the Cordillera de la Costa belt. These are overlain unconformably by the quartz-mica schists of the Las Brisas and Las Mer- cedes formations, generally believed to be Upper Jurassic to Lower Cretaceous in age (Menendez, 1967; Salvador and Stainforth, 1968). There are several amphibolite layers in 'the Las Mercedes formation which pro- bably were emplaced originally as basic igneous intrusions; serpentinites occur along the contact of the two formations in the northern part of the belt (Dengo, 1953). The El Tinaco gneisses and schists represent the pre-Mesozoic (?) basement complex in the Caucagua-El Tinaco belt. This basement is over- lain by varied groups of sedimentary and metasedimentary units, ranging in age from Lower to Upper Cretaceous (Menendez, 1962, 1967). These two tectonic belts form the Cordillera de la Costa mountains west of the Bay of Barcelona. They contain the oldest rocks exposed and a complex sequence of metasediment
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