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Ash-flow tuffs: Their origin, geologic relations, and identification

Professional Paper 366

By:
and

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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.

Additional Publication Details

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
Year Published:
1961
Language:
English
Publisher:
United States Government Printing Office
Description:
vi, 80 p.