The Cretaceous and Tertiary of southern Texas and northern Mexico ; Cretaceous Ammonites from Texas and northern Mexico
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Most of the investigations recorded in this bulletin were made by the authors while in the employ of the Richmond Petroleum Company of Mexico, S. A., by whom permission to publishhas been very generously extended. The Bureau of Economic Geology is very gladto be the medium of publication of this extended contribution to the geology hi southern Texas and northern Mexico and acknowledges its indebtedness both to the authors and to the company. It is believed that the publication will be useful in a large way to geologists and to the petroleum industry and other industries based on the geologic sciences.