PiLAN OF THE-PROJECT AND COURSE OF THE WORKA study of the geology of the San Juan Mountains was begun by Whitman Cross in 1895. The project was originally planned as an areal survey on folio scale (1:62,500) for presentation of local detail, with monographic treatment of stratigraphy, igneous geology, and associated economic reports. Early in the work Cross recognized the importance of the physiography and the Quaternary geology and in 1908 he recommended that those subjects be studied under the direction of the best available investigator. Fortunately, it was possible to get Wallace W. Atwood for this study, and in 1932 he and Kirtley F. Mather published a detailed report. Cross began the work in the western part of the area and by 1909 the field mapping of nine 15-minute quadrangles was completed. As shown in the following table, geological maps and descriptions of seven of these quadrangles have been published as folios in the Geological Atlas of the United States. In addition, a geological map and description of the southern part of the Lake City quadrangle has been published as a bulletin by Irving and Bancroft (1911). The early work in the area is summarized in the following table.
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