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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.
Filter Total Items: 6153
Human activities and ecological processes in bottomland hardwood ecosystems: the report of the Ecosystem Workgroup Human activities and ecological processes in bottomland hardwood ecosystems: the report of the Ecosystem Workgroup
No abstract available.
Authors
J. G. Gosselink, M.M. Brinson, L.C. Lee, Gregor T. Auble
Embryotoxicity and teratogenicity of environmental contaminants to bird eggs Embryotoxicity and teratogenicity of environmental contaminants to bird eggs
In light of recent ecological disasters such as the Exxon Valdez oil spill of 1989, which has already claimed the lives of thousands of aquatic birds with the reproductive success of countless others at risk, there is a need to evaluate the embryotoxic potential of a continuously growing number of industrial and agricultural environmental contaminants that may come in direct contact with...
Authors
David J. Hoffman
The California Valley grassland The California Valley grassland
Grasslands are distributed throughout California from Oregon to Baja California Norte and from the coast to the desert (Brown 1982) (Figure 1). This review will focus on the dominant formation in cismontane California, a community referred to as Valley Grassland (Munz 1959). Today, Valley Grassland is dominated by non-native annual grasses in genera such as Avena (wild oat), Bromus...
Authors
Jon E. Keeley
Sampling methods for terrestrial amphibians and reptiles Sampling methods for terrestrial amphibians and reptiles
No abstract available.
Authors
P.S. Corn, R.B. Bury
Geochemistry of highly fractionated I- and S-type granites from the tin-tungsten province of western Tasmania Geochemistry of highly fractionated I- and S-type granites from the tin-tungsten province of western Tasmania
The Devonian batholiths of western Tasmania represent a diverse assemblage of highly fractionated intrusions (70 to 77 percent SiO2) that are the products of different source materials. The Housetop batholith exhibits compositional affinities to a fluorine-rich I-type magma. The Meredith batholith also has characteristics indicative of I-type source materials. The Heemskirk batholith is...
Authors
Wayne N. Sawka, M.T. Heizler, R. W. Kistler, B. W. Chappell
Paleogeographic setting of upper Paleozoic rocks in the northern Sierra and eastern Klamath terranes, northern California Paleogeographic setting of upper Paleozoic rocks in the northern Sierra and eastern Klamath terranes, northern California
Upper Paleozoic rocks of the northern Sierra and eastern Klamath terranes provide detailed stratigraphic records of ensimatic arc-related sedimentation and magmatism. Comparison of Paleozoic stratigraphic relations between the two terranes, however, suggests certain contrasts in depositional environments and the nature, volume, and timing of volcanism for given time intervals. Some...
Authors
David S. Harwood, M. Meghan Miller
Chemistry of trace elements in soils and groundwater Chemistry of trace elements in soils and groundwater
No abstract available.
Authors
Steven J. Deverel, Sabine Goldberg, Roger Fujii
Age and depositional setting of siliceous sediments in the upper Paleozoic Havallah sequence near Battle Mountain, Nevada; Implications for the paleogeography and structural evolution of the western margin of North America Age and depositional setting of siliceous sediments in the upper Paleozoic Havallah sequence near Battle Mountain, Nevada; Implications for the paleogeography and structural evolution of the western margin of North America
The upper Paleozoic Havallah sequence of central Nevada is a folded and thrust-faulted association of greenstone, siliceous marine sedimentary rocks, and deep-water clastic rocks. Microfossil assemblages (radiolarians, sponge spicules, and conodonts) are used as tools to unravel the stratigraphy and to interpret the paleoenvironments of the siliceous sedimentary rocks. Nine radiolarian...
Authors
Benita L. Murchey
Biostratigraphic, tectonic, and paleogeographic ties between upper Paleozoic volcanic and basinal rocks in the northern Sierra terrane, California, and the Havallah sequence, Nevada Biostratigraphic, tectonic, and paleogeographic ties between upper Paleozoic volcanic and basinal rocks in the northern Sierra terrane, California, and the Havallah sequence, Nevada
Biostratigraphic data, based mostly on radiolarian assemblages, establish synchronous deposition in the northern Sierra terrane and the Havallah basin beginning in the Late Devonian and extending into the early Late Permian. Lower Mississippian and mid-Permian arc-derived volcaniclastic debris was deposited in parts of the Havallah basin during episodes of arc volcanism in the northern...
Authors
David S. Harwood, Benita L. Murchey
Fish community structure and microhabitat use in regulated and natural Alabama rivers Fish community structure and microhabitat use in regulated and natural Alabama rivers
No abstract available.
Authors
K.J. Scheidegger, M.B. Bain
Seismic imaging of extended crust with emphasis on the western United States Seismic imaging of extended crust with emphasis on the western United States
Understanding of the crust has improved dramatically following the application of seismic reflection and refraction techniques to studies of the deep crust. This is particularly true in areas where the last tectonic event was extensional, such as the Basin and Range province of the western United States and much of western Europe. In these regions, a characteristic reflective pattern has...
Authors
Jill McCarthy, George A. Thompson