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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse more than 5,500 book chapters authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.
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Geology and saline resources of Danby Playa, southeastern California Geology and saline resources of Danby Playa, southeastern California
No abstract available
Authors
J.P. Calzia
Miocene monzonitic intrusions and associated megabreccias of the "Iron Axis" region, southwestern Utah Miocene monzonitic intrusions and associated megabreccias of the "Iron Axis" region, southwestern Utah
No abstract available
Authors
H. R. Blank, P. D. Rowley, D.B. Hacker
Structure and fabric of metamorphic terrains in the northeastern Great Basin; implications for Mesozoic crustal short ening and extension Structure and fabric of metamorphic terrains in the northeastern Great Basin; implications for Mesozoic crustal short ening and extension
No abstract available
Authors
P.A. Camilleri, D. M. Miller, A.W. Snoke, M.L. Wells
Regional characterization and setting for the Loch Vale Watershed study Regional characterization and setting for the Loch Vale Watershed study
No abstract available.
Authors
Jill S. Baron, M.A. Mast
Effects of weather and soil characteristics on temporal variations in soil-gas radon concentrations Effects of weather and soil characteristics on temporal variations in soil-gas radon concentrations
Concentrations of radon-222 in soil gas measured over about 1 yr at a monitoring site in Denver, Colorado, vary by as much as an order of magnitude seasonally and as much as severalfold in response to changes in weather. The primary weather factors that influence soil-gas radon concentrations are precipitation and barometric pressure. Soil characteristics are important in determining the...
Authors
R. Randall Schumann, Douglass E. Owen, Sigrid Asher-Bolinder
Partially melted granodiorite and related rocks ejected from Crater Lake caldera, Oregon Partially melted granodiorite and related rocks ejected from Crater Lake caldera, Oregon
Blocks of medium-grained granodiorite to 4 m, and minor diabase, quartz diorite, granite, aplite and granophyre, are common in ejecta of the ∼6,900 yr BP caldera-forming eruption of Mount Mazama. The blocks show degrees of melting from 0–50 vol%. Because very few have adhering juvenile magma, it is thought that the blocks are fragments of the Holocene magma chamber’s walls. Primary...
Authors
Charles R. Bacon
Source region of a granite batholith: evidence from lower crustal xenoliths and inherited accessory minerals Source region of a granite batholith: evidence from lower crustal xenoliths and inherited accessory minerals
Like many granites, the Late Cretaceous intrusives of the eastern Mojave Desert, California, have heretofore provided useful but poorly focused images of their source regions. New studies of lower crustal xenoliths and inherited accessory minerals are sharpening these images. Xenoliths in Tertiary dykes in this region are the residues of an extensive partial melting event. Great...
Authors
Calvin F. Miller, John M. Hanchar, Joseph L. Wooden, Victoria C. Bennett, T. Mark Harrison, David A. Wark, David A. Foster