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New Mexico Geological Society
Special Publication - 9
Ash-Flow Tuffs: Their Origin, Geologic Relations and Identification and Zones and Zonal Variations in Welded Ash Flows
![cover](/publications/nmgs/special/9/spl_9.jpg)
Jonathan F. Callender, ed, 1980, 104 pages, NMGS.
Twenty years have passed since publication of U.S. Geological Survey Professional Papers 366, Ash-flow tuffs: Their origin, geologic relations and identification, by C. S. Ross and R. L. Smith (1961), and 354-F, Zones and zonal variations in ash-flows, by R. L. Smith (1960). As these papers are now being republished, perhaps a few words are appropriate to clarify their historical evolution and to view them in the context of the present time. Clarence Ross and I began an intensive general study of microscopic and field characteristics of"welded tuffs" in 1948, in the hope that such a study would aid our interpretation of the Bandelier Tuff, Jemez Mountains, New Mexico. The study led to a general overview which became Professional Paper 366. Professional Paper 366 was written during the late 1940's and early 1950's.
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