The Humboldt Channel: Early Pleistocene extensional graben through eastern Venezuela and Trinidad. Macsotay, O. 2005

Transactions of the 16th Caribbean Geological Conference, Barbados. Caribbean Journal of Earth Science, 39 (2005), 83-91.

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Since Alexander Von Humboldt (1814-1824) predicted the future union of the gulfs of Cariaco and Paria, attention was drawn to an extensive east-west oriented valley separating the coastal ranges of the north, from the Serrania del Interior Oriental in the south. Liddle (1946) mapped the Araya-Paria coastal ranges as metamorphic rocks, and the Serrania to the south as sedimentary, mostly Cretaceous and Paleogene. This elongated depression was an area of frequent earthquakes, with hundreds of hydrothermal water springs, and occasional oil seeps  mentioned by Urbani, 1989

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