Ash-flow tuffs: Their origin, geologic relations, and identification
Professional Paper
366
By: Clarence S. Ross and Robert L. Smith
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Abstract
Pyroclastic materials, which are interpreted as having been deposited by flowage as a suspension of ash in volcanic gas, are becoming widely recognized as major geologic episodes. These may be unconsolidated, indurated by partial welding, or welded into a compact rock. Many students are working on these materials and the interest in them is so widespread that need for a coordinated treatise on them has developed. This report deals with the history of the concept of their origin; gives detailed descriptions of their character and mode of occurrence; gives criteria for their recognition; and considers their distribution and consolidation.
Suggested Citation
Ross, C., and Smith, R.L., 1961, Ash-flow tuffs: Their origin, geologic relations, and identification: U.S. Geological Survey Professional Paper 366, vi, 80 p., https://doi.org/10.3133/pp366.
ISSN: 2330-7102 (online)
| Publication Type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Ash-flow tuffs: Their origin, geologic relations, and identification |
| Series Title | Professional Paper |
| Series Number | 366 |
| DOI | 10.3133/pp366 |
| Year Published | 1961 |
| Language | English |
| Publisher | United States Government Printing Office |
| Description | vi, 80 p. |