Tertiary sediments are found at many places in the East Indies and Equatorial America, but those of Java and of the West Indies have been most intensively studied. The studies in Java were made in a search for oil; those in the West Indies were made because of the extremely interesting faunas found there. These sediments which in large part are marine, are the ones that are of the greatest interest in a study of the spread of East Indian forms to Equatorial America, and especially so when there is involved in this study the great thickness of marine sediments (25,000 feet or more) which accumulated on the site of the desert on the north coast of Peru.
The East Indian faunas have been worked out in detail by Dutch geologists, especially by Martin,3 van der Vlerk,4 and Umbgrove.5 Paleontological work has been done in Equatorial America by Woods,6. . .