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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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Very different crustal response to extreme extension in the southern Basin and Range and Colorado Plateau transition Very different crustal response to extreme extension in the southern Basin and Range and Colorado Plateau transition
Clustered about the southwest edge of the Colorado Plateau lie many highly extended terranes. Among these are metamorphic core complexes, distinguished by low-angle normal faults with sufficient offset to expose middle crustal rocks at higher elevation relative to the surrounding areas. About 150 km to the southwest, strong extension in the Salton Trough manifests itself very differently...
Authors
Tom Parsons, Jill McCarthy, George A. Thompson
Potential consequences of climate variability and change on coastal areas and marine resources Potential consequences of climate variability and change on coastal areas and marine resources
No abstract available.
Authors
John C. Field, Donald F. Boesch, Donald Scavia, Robert Buddemeier, Virginia Burkett, Daniel Cayan, Michael Fogarty, Mark Harwell, Robert Howarth, Curt Mason, L.J. Pietrafesa, Denise Reed, Thomas Royer, Asbury Sallenger, Michael Spranger, James G. Titus
Potential consequences of climate variability and change for the Southeastern United States Potential consequences of climate variability and change for the Southeastern United States
No abstract available.
Authors
Virginia Burkett, Ronald Ritschard, Steven McNulty, J. J. O’Brien, Robert C. Abt, James Jones, Upton Hatch, Brian Murray, Shrikant Jagtap, Jim Cruise
Sequence stratigraphy of a South Florida carbonate ramp and bounding siliciclastics (late Miocene-Pliocene) Sequence stratigraphy of a South Florida carbonate ramp and bounding siliciclastics (late Miocene-Pliocene)
In southern peninsular Florida, a late-early to early-late Pliocene carbonate ramp (Ochopee Limestone Member of the Tamiami Formation) is sandwiched between underlying marine siliciclastics of the late Miocene to early Pliocene Peace River Formation and an overlying late Pliocene unnamed sand. At least three depositional sequences (DS1, DS2, and DS3), of which two contain condensed...
Authors
Kevin J. Cunningham, David Bukry, T. Sato, John A. Barron, Laura A. Guertin, Ronald S. Reese
Significance of type Devils Gate Limestone on Devonian proto-Antler forebulge, west of Eureka, Nevada Significance of type Devils Gate Limestone on Devonian proto-Antler forebulge, west of Eureka, Nevada
No abstract available.
Authors
Charles Sandberg, J. R. Morrow, Forrest G. Poole
Careers in marine mammal medicine Careers in marine mammal medicine
No abstract available.
Authors
Leslie A. Dierauf, Salvatore Frasca, T. Y. Mashima
Gas hydrate in the ocean environment Gas hydrate in the ocean environment
No abstract available.
Authors
William P. Dillon
Lower Colorado River: Framework, neogene deposits, incision, and evolution Lower Colorado River: Framework, neogene deposits, incision, and evolution
No abstract available.
Authors
Keith A. Howard, Robert G. Bohannon
Role of environmental variability in evaluating stressor effects Role of environmental variability in evaluating stressor effects
In this chapter, we discuss how environmental variability affects the exposure of organisms and ecological systems to stressors, and give guidance on how to understand influences of stressors. We consider the characteristics of environmental variability and issues relating to the measurement of environmental variation. We discuss how to select the optimal indicators of ecological...
Authors
Samuel N. Luoma
Magnetostratigraphy of the Eocene-Oligocene San Lorenzo and Vaqueros formations, Santa Cruz Mountains, California; implications for California biostratigraphic zonations Magnetostratigraphy of the Eocene-Oligocene San Lorenzo and Vaqueros formations, Santa Cruz Mountains, California; implications for California biostratigraphic zonations
The San Lorenzo and Vaqueros formations in the Santa Cruz Mountains are the only place in the Pacific Coast that provide a superposed record of the middle Eocene to late Oligocene Narizian, Refugian, and Zemorrian benthic foraminiferal stages, and also yields planktonic microfossils that can be used to correlate these strata with the global time scale. Magnetic samples were taken from...
Authors
D.R. Prothero, Joey Sutton, E. E. Brabb
Magnetic stratigraphy of the lower middle Eocene (type Ulatsian) Vacaville Shale, Solano County, California Magnetic stratigraphy of the lower middle Eocene (type Ulatsian) Vacaville Shale, Solano County, California
Mallory (1959) designated exposures of the Vacaville Shale on Ulatis Creek, northwest o Vacaville, California, as the type section of his lower middle Eocene Ulatisian benthic foraminiferal stage. Magnetic samples were taken from the 75 m of exposed section, and yielded a stable remanence held mainly in magnetite which passed a reversal test. The section showed two normal zones and three...
Authors
D.R. Prothero, E. E. Brabb
Deposition of Mount Mazama tephra in a landslide-dammed lake on the upper Skagit River, state of Washington Deposition of Mount Mazama tephra in a landslide-dammed lake on the upper Skagit River, state of Washington
The cataclysmic eruption of Mount Mazama, Oregon, at c. 6730 (super 14) C yr BP, deposited tephra over 1.0 X 10 (super 6) km (super 2) of north-western North America. Primary tephra fall accumulated to a thickness of 2 cm in the upper Skagit River watershed, Washington. Mazama tephra eroded from this watershed was deposited in Lake Ksnea, of 14 km length and 40 m depth. This lake was...
Authors
Jon Riedel, P. T. Pringle, Robert L. Schuster