Skip to main content
U.S. flag

An official website of the United States government

Accretionary lapilli in altered tuffs associated with coal beds.

January 1, 1984

Accretionary lapilli (concentrically-zoned structures with featureless cores and layered rims, composed of volcanic materials) have been previously recognized in recent volcanic eruptions, and in rocks from obvious volcanic environments. The present paper extends the known occurrences to rocks of less obvious volcanic origin; in some cases the lapilli are the primary evidence for their volcanic origin. They are reported from tonsteins (clay beds associated with coals and generally interpreted as altered tuffs), and clays not associated with coals or previously interpreted as volcanic in origin, (flint in Missouri and Kentucky). -W.P.F.

Citation Information

Publication Year 1984
Title Accretionary lapilli in altered tuffs associated with coal beds.
DOI
Authors B.F. Bohor, Don M. Triplehorn
Publication Type Article
Publication Subtype Journal Article
Series Title Journal of Sedimentary Petrology
Series Number
Index ID 70013180
Record Source USGS Publications Warehouse
USGS Organization