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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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Uranium-series ages, faunal correlations and tectonic deformation of marine terraces within the Agua Blanca fault zone at Punta Banda, northern Baja California, Mexico Uranium-series ages, faunal correlations and tectonic deformation of marine terraces within the Agua Blanca fault zone at Punta Banda, northern Baja California, Mexico
No abstract available.
Authors
T. K. Rockwell, D.R. Muhs, G. L. Kennedy, M.E. Hatch, S.M. Wilson, R.E. Klinger
Vegetation of wetlands of the prairie pothole region Vegetation of wetlands of the prairie pothole region
Five themes dominate the literature dealing with the vegetation of palustrine and lacustrine wetlands of the prairie pothole region: environmental conditions (water or moisture regime, salinity), agricultural disturbances (draining, grazing, burning, sedimentation, etc.), vegetation dynamics, zonation patterns, and classification of the wetlands.The flora of a prairie wetland is a...
Authors
H.A. Kantrud, J.B. Millar, A.G. Van Der Valk
Waterfowl mortality factors Waterfowl mortality factors
The objectives of waterfowl management in North America involve population size and harvest. Any management action intended to influence population size must do so through one of four demographic variables: reproduction, mortality, immigration, and emigration. Mortality is especially important because hunting can be strongly influenced by management.
Authors
J.D. Nichols
Western habitats - Session summary Western habitats - Session summary
Determining the status of all habitats in the nine western states considered in this symposium is a difficult task. The authors of habitat status papers commented that the diversity of habitat classification systems limited their ability to relate habitat status to raptors. Differences of scale, objectives and survey design have hindered integration of habitat classification methods used...
Authors
K. Titus, M.R. Fuller
Pattern and process in arid-region salt marshes - Southern California Pattern and process in arid-region salt marshes - Southern California
No abstract available.
Authors
Christopher P. Onuf, Joy B. Zedler
Annual body weight change in ring-neck ducks (Aythya collaris) Annual body weight change in ring-neck ducks (Aythya collaris)
No abstract available.
Authors
William L. Hohman, T. Scott Taylor, Milton W. Weller
Evaluation of the continuous seismic-reflection method for determining the thickness and lithology of stratified drift in the glaciated northeast Evaluation of the continuous seismic-reflection method for determining the thickness and lithology of stratified drift in the glaciated northeast
No abstract available.
Authors
F.P. Haeni
Metamorphic and tectonic evolution of the Franciscan Complex, northern California: Chapter 38 Metamorphic and tectonic evolution of the Franciscan Complex, northern California: Chapter 38
No abstract available.
Authors
M. Clark Blake, A. S. Jayko, R. J. McLaughlin, M.B. Underwood
Pb isotopic evidence for the formation of Proterozoic crust in the southwestern United States Pb isotopic evidence for the formation of Proterozoic crust in the southwestern United States
No abstract available.
Authors
J. L. Wooden, J. S. Stacey, Keith A. Howard, B. R. Doe, D. M. Miller
The Blake Plateau Basin and Carolina Trough The Blake Plateau Basin and Carolina Trough
Presently, the continental margin of the southeastern United States (Fig. 1) forms a zone of transition between the actively building, steep-fronted carbonate platform of the Bahamas and the typical eastern North American terrigenous clastic-dominated, drowned, shelf-slope-rise configuration. This region of the continental margin is underlain by two major sedimentary basins—the Blake...
Authors
William P. Dillon, Peter Popenoe
The Mount Mazama climactic eruption (6900 BP) and resulting convulsive sedimentation on the continent, ocean basin, and Crater Lake caldera floor The Mount Mazama climactic eruption (6900 BP) and resulting convulsive sedimentation on the continent, ocean basin, and Crater Lake caldera floor
The climactic eruption of Mount Mazama and the resulting sedimentation may have been the most significant convulsive sedimentary event in North America during Holocene time. A collapse caldera 1,200 m deep and 10 km in diameter was formed in Mount Mazama, and its floor was covered by hundreds of meters of wall-collapse debris. Wind-blown pyroclastic ash extended 2,000 km northeast from...
Authors
C. Hans Nelson, Paul R. Carlson, Charles R. Bacon
Historical changes in the major fish resources of the Great Lakes Historical changes in the major fish resources of the Great Lakes
My purpose here is to review historic changes in the major fish resources of the five Great Lakes, and to identify the cause or causes for those changes. In some instances it will be clear that intensive fishing was the primary cause of change; in other instances it will be nearly as clear that predation by the sea lamprey played a significant if not dominant role in change; and in still...
Authors
Wilbur L. Hartman