Abstract

The majority of authors who have investigated the Devonian strata of Bolivia have referred to Icla and Sicasica (Departments of Chuquisaca and La Paz) as classic localities for the study of the Devonian System. Their works have served as a base for time-stratigraphic comparisons, and as references for every geologist and student, national or foreign, who has studied the Devonian System of Bolivia. In all these investigations, the base of Bolivia’s Devonian System has been observed to be in the lower limits of the Icla Formation.

However appropriate these localities may be for studies of this nature, there undoubtedly exist others, such as Pojo, Montana Negra, Viloco, etc., where the sequence is closer to complete. A detailed study of these sections leads one to believe that the lower limits of the Devonian System of Bolivia ought to be situated stratigraphically lower than the Icla; that is to say, in the upper part of the Pampa Formation.