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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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Use of detrended correspondence analysis in evaluating factors controlling species composition of periphyton
Detrended correspondence analysis (DCA) was evaluated for its usefulness in elucidating relationships among samples and among species of periphyton in an oligotrophic stream, and for its effectiveness in displaying major gradients where an experimental gradient (copper) affecting species composition was imposed. It was highly sensitive to differences among samples and consistently provided ecologi
Authors
Harry V. Leland, James L. Carter
Use of miniroutes and Breeding Bird Survey data to estimate abundance
1. Information on relative abundance is easily obtained and adds greatly to the value of an atlas project. 2. The Breeding Bird Survey (BBS) provides annual counts (birds per 50 roadside stops) that can be used to: (1) map relative abundance by physiographic region within a state or province, (2) map relative abundance on a more local scale by using results from individual routes, or (3) compute
Authors
C.S. Robbins, B.A. Dowell
Age and tectonics of plutonic belts in accreted terranes of the Klamath Mountains, California and Oregon
No abstract available.
Authors
W. P. Irwin
History of the Atlantic continental margin off Florida: The Blake Plateau basin
No abstract available.
Authors
William P. Dillon, C. K. Paull, L. Gilbert, C. Wylie Poag
Outline of tertiary stratigraphy and depositional history of the U.S. Atlantic Coastal Plain
No abstract available.
Authors
L. W. Ward, G. Strickland, C. Wylie Poag
Seismic stratigraphy of the continental slope and rise seaward of Georges Bank
No abstract available.
Authors
J. S. Schlee, C. Wylie Poag, K. Hinz
Stratigraphy and tectonic significance of the Mesozoic tectonostratigraphic terranes of the Vizcaino Peninsula, Baja California Sur, Mexico
No abstract available.
Authors
Thomas E. Moore
Tectonostratigraphic terranes in southwest Oregon
No abstract available.
Authors
M. C. Blake, Jr., D.E. Engebretson, A. S. Jayko, J. L. Jones
Tectonostratigraphic terranes of northern California
No abstract available.
Authors
M. Clark Blake, A. S. Jayko, R. J. McLaughlin
Variations in the global carbon cycle during the Cretaceous related to climate, volcanism, and changes in atmospheric CO2
The stratigraphic record from both deep-sea and shallow-water depositional environments indicates that during late Aptian through Cenomanian time (1) global climates were considerably warmer than at present; (2) latitudinal gradients of atmospheric and oceanic temperatures were considerably less than at present; (3) rates of accumulation of organic matter of both marine and terrestrial origin were
Authors
M.A. Arthur, Walter E. Dean, S. O. Schlanger
Cyclic variations in calcium carbonate and organic carbon in Miocene to Holocene sediments, Walvis Ridge, South Atlantic Ocean
The entire upper Miocene to Holocene sedimentary sequence recovered in a hydraulic piston core at DSDP Site 532 on Walvis Ridge shows distinct cycles in amount of CaCO sub(3) that correlate with dark and light cycles of sediment color. The average periodicities of the carbonate cycles for the Quaternary, upper Pliocene, and lower Pliocene are about 35, 46, and 28 ky, respectively, with an overall
Authors
Walter E. Dean, J. V. Gardner