Abstract
The Paleocene and Eocene shales of the state of Lara, northwestern Venezuela, contain boulders and slabs (more than 1 kilometer in length) of pre-Cretaceous, Cretaceous, and Paleocene rocks. It is believed that this allochthonous material originated from the breaking-off of submarine escarpments caused by vertical tectonic displacements along the edges of the Barquisimeto trough. This material is thought to have moved by gravitational sliding toward the center of the trough; it has been encountered at distances of at least 30 kilometers from its nearest possible source. Calcareous sandstones with graded bedding, resulting from turbidity currents, are associated with the shales containing the boulders.
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