GEOLOGIC SETTING OF NORTHEASTERN VENEZUELA Eastern Venezuela may be divided into three major physiographic and geologic provinces (Fig. 1). The highlands of Venezuelan Guayana south of the Orinoco River are composed largely of igneous and metamorphic rocks with some large remnants of pre-Tertiary sediments. Along the northern coast is the Caribbean Mountain system consisting of a narrow coastal belt of metamorphic rocks (Serrania de la Costa) flanked on the south by upturned and folded Cretaceous and Tertiary strata (Serrania del Interior). Between Guayana on the south and the foothills of the Serrania del Interior on the north lie the vast, nearly featureless Quaternary-covered plains of the Venezuelan llanos and the Orinoco delta.
The llanos and delta areas belong to the so-called Orinoco geosyncline1 which has been the site of marine or brackish-water deposition throughout most of the interval from early Cretaceous to present time. Venezuelan Guayana, on the other . . .
- Received 23 April 1937.
- © 1937 Geological Society of America