Arkell.1956.Jurassic..

THE ANDES OF SOUTH AMERICA 579
parts of Colombia and Venezuela. They usually pass upwards without a
break into similar beds believed to be Lower Cretaceous. On the east side
of the Central Cordillera of Colombia, however, the red beds are overlapped
by Lower Cretaceous strata dated to the Barremian at latest (Trumpy,
1943). The thickness of the red beds is usually about 2500 m. in east
FIG. 94.—The chief marine Jurassic outcrops of South America. After Stose,
1950.
Peru and east Equador, and from 500 m. to 3000 m. in Colombia and
Venezuela, but in the Cesar Valley in the north of Colombia it exceeds
4000 m. (For east Peru see Huff, 1949; for east Equador, Tschopp,
1945; for Colombia and Venezuela, Oppenheim, 1940, Trumpy, 1943;
general, Hedberg, 1942).
In the areas of marine deposition, correspondence of the South American
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