Volume 72, Number 3, Pages 387-426.

Christiansen, R. L., and Blank, H. R., Jr., 1972, Volcanic stratigraphy of the Quaternary rhyolite plateau in Yellowstone National Park: U.S. Geological Survey, Professional Paper 729-B (in press).

Dorf, Erling, 1960, Tertiary fossil forests of Yellowstone National Park, Wyoming, in West Yellowstone—Earthquake area, Billings Geological Society Guidebook 11th Annual Field Conference, 1960: pages 253-260.

Hague, Arnold, Iddings, J. P., Weed, W. H., Walcott, C. D., Girty, G. H., Stanton, T. W., and Knowlton, F. H., 1899, Geology of the Yellowstone National Park: U.S. Geological Survey Monograph 32, part 2, 893 pages and atlas of 27 sheets folio.

Hague, Arnold, Weed, W. H., and Iddings, J. P., 1896, Description of the Yellowstone National Park quadrangle [Wyoming]: U.S. Geological Survey Geologic Atlas, Folio 30.

Hayden, F. V., 1872, Preliminary report of the United States Geological Survey of Montana and portions of adjacent Territories, being a fifth annual report of progress—Part I: Washington, U.S. Government Printing Office, pages 13-204.

Howard, A. D., 1937, History of the Grand Canyon of the Yellowstone: Geological Society of America Special Paper 6, 159 pages.

Marler, G. D., 1969, The story of Old Faithful: Yellowstone Library and Museum Association, 49 pages.

Richmond, G. M., Pierce, K. L., and Waldrop, H. A., 1972, Surficial geologic map of Yellowstone National Park: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-710 (in press).

Ruppel, E. T., 1972, Geology of pre-Tertiary rocks in the northern part of Yellowstone National Park, Wyoming: U.S. Geological Survey Professional Paper 729-A (in press).

Smedes, H. W., and Prostka, H. J., 1972, Absaroka Volcanic Supergroup in the Yellowstone National Park region: U.S. Geological Survey Professional Paper 729-C (in press).

Smith, R. L., 1960, Ash flows: Geological Society of America Bulletin,