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<br />,-,-.-,-, <br /> <br />;". ,6-. <br /> <br />closely related to the geologic hazard conditions outlined in the en- <br /> <br />suing report. <br /> <br />SOURCES OF DATA <br /> <br />Photogeologic Studies <br />Photog eo logic studies utilized five different sets of stereoscopic <br />aerial photographs, taken at intervals between 1945 and 1971. Scale of <br />the various sets of photographs varies hetween'1:70,000 and 1:12,000. <br />In addition to stereoscopic study,' single frame oblique photos taken by <br />the U.S. Forest Service were e~amined. Black and. white Polaroid photo- <br /> <br /> <br />graphs and 35 mm. color slides were taken to depict and document field <br /> <br /> <br />observations. Some of these photos are included in the report, and <br /> <br /> <br />others which are considered a part of the report are available for in- <br /> <br />spection at the office of the Colorado Geological Survey. Comparison <br />of the aerial photographs of different vintages afforded considerable <br /> <br />insight into ongoing geologic processes such as the frequent mudflows <br /> <br />which have occurred on Slate and Carbonate Creeks. <br /> <br />Geologic Literature <br />The earliest available geologic study covering the Marble area is <br />contained in Chapter IV of the Annual Report of the U.S. Geological <br />Survey for the year 1876. Thia report entitled; "Geology of the North- <br />western Portion of the Elk Range," was written by W. H. Holmes of the <br /> <br />Hayden Expedition. The Holmes report consists of a geologic reconnais- <br /> <br />sance traverse along Rock Creek (Rock Creek is the older name for the <br /> <br />Crystal River). The report includes observations in the Marble area <br />and adjacent areas along the Ctysta1 River. Most recent and detailed <br /> <br />published geologic literature of the area is the U.S. Geological Survey <br /> <br />',,' <br /> <br />" <br />