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Coal Basin Tract <br /> August 18, 1996 <br /> mapping, topographic maps, and aerial photography can be used to <br /> delineate these areas followed by field review. <br /> Rusty Dersch <br /> Regional Geologist <br /> August 18, 1996 <br /> REFERENCES <br /> Collins, B. A. , 1977, Geology of the Coal Basin Area, Pitkin <br /> County, Colorado: Rocky Mountain Association of Geologists, <br /> 1977 Symposium, p. 363-378. <br /> Costa, J. E. , and Jarrett, R. D. , 1981, Debris flows in small <br /> mountain stream channels of Colorado and their hydrologic <br /> implications: Bulletin of the Association of Engineering <br /> Geologists, Vol. XVIII, No. 3, p. 309-322. <br /> Ritter, D. F. , 1978, Process Geomorphology: Wm. C. Brown Company <br /> Publishers, Dubuque, IA, p. 237. <br /> 7 <br />