Book Chapters
Science Quality and Integrity
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
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.
Filter Total Items: 6063
The planning process
No abstract available.
Authors
Carol C. Russell, Kathleen S. Smith, Virginia T. McLemore
Thermochronology of Cretaceous batholithic rocks in the northern Peninsular Ranges batholith, southern California: Implications for the Late Cretaceous tectonic evolution of southern California
The thermochronology for several suites of Mesozoic metamorphic and plutonic rocks collected throughout the northern Peninsular Ranges batholith (PRB) was studied as part of a collaborative isotopic study to further our understanding of the magmatic and tectonic history of southern California. These sample suites include: a traverse through the plutonic rocks across the northern PRB (N = 29), a tr
Authors
Daniel P. Miggins, Wayne R. Premo, Lawrence W Snee, Ross Yeoman, Nancy D. Naeaer, Charles W. Naeser, Douglas M. Morton
Thermodynamic properties for arsenic minerals and aqueous species
Quantitative geochemical calculations are not possible without thermodynamic databases and considerable advances in the quantity and quality of these databases have been made since the early days of Lewis and Randall (1923), Latimer (1952), and Rossini et al. (1952). Oelkers et al. (2009) wrote, “The creation of thermodynamic databases may be one of the greatest advances in the field of geochemist
Authors
D. Kirk Nordstrom, Juraj Majzlan, Erich Königsberger
Threats and conservation needs for North American tortoises
No abstract available
Authors
Kristin H. Berry, M.J. Aresco
Tracking changes in volcanic systems with seismic Interferometry
The detection and evaluation of time-dependent changes at volcanoes form the foundation upon which successful volcano monitoring is built. Temporal changes at volcanoes occur over all time scales and may be obvious (e.g., earthquake swarms) or subtle (e.g., a slow, steady increase in the level of tremor). Some of the most challenging types of time-dependent change to detect are subtle variations i
Authors
Matthew M. Haney, Alicia J. Hotovec-Ellis, Ninfa L. Bennington, Silvio De Angelis, Clifford Thurber
U-Pb zircon geochronology of plutonism in the northern Peninsular Ranges batholith, southern California: Implications for the Late Cretaceous tectonic evolution of southern California
Utilizing both sensitive high-resolution ion microprobe (SHRIMP) and conventional isotope dilution–thermal ionization mass spectrometry (ID-TIMS) methods, crystallization and/or emplacement ages have been obtained for a suite of Cretaceous intermediate-composition plutonic samples collected along a roughly E-W–trending traverse through the northern Peninsular Ranges batholith. Previously noted pet
Authors
Wayne R. Premo, Douglas M. Morton, Joseph L. Wooden, C. Mark Fanning
Waterfowl ecology and management
No abstract available.
Authors
Joshua T. Ackerman, Mark P. Herzog, Gregory S. Yarris, Michael L. Casazza, E. Burns, John M. Eadie
Research strategies for addressing uncertainties
There is an immense volume of information pertaining to research needs for addressing climate change uncertainties and resolving key information gaps. Fortunately, multiple independent efforts to establish research priorities have yielded similar results. Input on research needs is being used to craft national scientific priorities and strategies that are being implemented regionally by agencies a
Authors
David E. Busch, Levi D. Brekke, Kristen Averyt, Angela Jardine, Leigh Welling
Change-in-ratio
Change-in-ratio (CIR) methods are used to estimate parameters for ecological populations subject to differential removals from population subclasses. Subclasses can be defined according to criteria such as sex, age, or size of individuals. Removals are generally in the form of closely monitored sport or commercial harvests. Estimation is based on observed changes in subclass proportions caused by
Authors
Mark S. Udevitz
Land surface phenology
Certain vegetation types (e.g., deciduous shrubs, deciduous trees, grasslands) have distinct life cycles marked by the growth and senescence of leaves and periods of enhanced photosynthetic activity. Where these types exist, recurring changes in foliage alter the reflectance of electromagnetic radiation from the land surface, which can be measured using remote sensors. The timing of these recurrin
Authors
Jonathan M. Hanes, Li Li, Jeffrey T. Morisette