Abstract
During spring and summer of 1915, an expedition was sent to the peninsula of Lower California (Baja California) by a Swiss Colonization Company. The scientific work was under the direction of the writer, who enjoyed excellent assistance from his friends Prof. Dr. Ad. Hartmann, of Aarau, and Top. Eng. E. Kluth, of Zurich. Although little time was available for stratigraphic studies, some of our observations of that almost unknown country seem to be worthy of publication.

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