Abstract The latest Cenozoic (< 6 Ma) ash beds in the western United States have been
intensively studied for several decades. The more widespread of these ash beds are well …

A 900-m-thick section of tuffaceous sedimentary rock, vitric fallout tuff, and ash-flow tuff is
well exposed along Trapper Creek in south-central Idaho. This section provides nearly …

Unaltered silicic ash fall tuffs are abundant in Neogene sedimentary basins of the western
US and constitute an important record of explosive silicic volcanism in this region. In …

The abundant mudrocks of the upper Eocene to lower Oligocene White River sequence
(Great Plains and central Rocky Mountains) are largely composed (-60%) of volcaniclasts …

Abstract The Lawlor Tuff is a widespread dacitic tephra layer produced by Plinian eruptions
and ash flows derived from the Sonoma Volcanics, a volcanic area north of San Francisco …

Stratigraphic relationships and tephrochronologic information for volcanic ash beds (4.0–0.1
my) of the Western Interior allow the recognition of at least 68 different ash falls. The average …

Deformed late Cenozoic tuffs in the central Coast Ranges of California have been correlated
by means of trace-and minorelement chemistry of volcanic glass, supported by potassium …

Two pumiceous vitric-crystal tuffs, the Hatton Tuff Lentil and Beavers Bend tuff, occur in the
deep-marine Mississippian Stanley Group. These widespread rhyodacitic tuffs range in …

Sedimentary sequences in the Columbia Plateau region of the Pacific Northwest ranging in
age from 16–4 Ma contain fallout tuffs whose origins lie in volcanic centers of the …

Unusual monotonous intermediate ignimbrites consist of phenocryst-rich dacite that occurs
as very large volume (> 1000 km3) deposits that lack systematic compositional zonation …