Data of the geology of Panama and Costa Rica were collected during 1917 and 1918 by the geologic staff of more than a dozen members who worked under the writer’s direction. Previous to 1917, the writer was more or less familiar with the general geologic conditions of these countries and especially with the geology of the Canal Zone.
The facts here presented are a mere outline of the stratigraphic conditions observed. In their preparation, the writer is probably more indebted to Mr. A. A. Olsson, formerly of the Paleontological Department of the Cornell University, and Dr. Henry Hinds, formerly of...
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