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In the headwaters of Rio Yapacani, a tributary of Rio Mamore of north-central Bolivia, a rather complete stratigraphic section from the Tertiary Chaco group down to the quartzites of the Ordovician is exposed. The area of the upper Yapacani lies in the center of the big knee-bend in the Subandean Zone which was caused by large left-lateral displacements along the postulated Ichilo fault zone. A well developed, left-lateral strike-slip fault, named the Colorado fault, cutting across the Yapacani valley, is interpreted as the southern branch of the Ichilo fault zone. The Ichilo fault zone might be the western part of a transcontinental zone of disturbance, the eastern part of which could probably be represented by the Posadas-Torres Geoklase reported from the State of Rio G ande, do Sul in Brazil.
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