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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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Calcareous nannofossils and forarninifers from Paleocene and Eocene strata in Maryland and Virginia
No abstract available
Authors
L. M. Bybell, T. G. Gibson
Modelling of turbidity currents on Navy Submarine Fan, California Continental Borderland
Several Holocene turbidites can be correlated across much of Navy Fan through more than 100 sediment core localities. The uppermost muddy turbidite unit is mapped throughout the northern half of the fan; its volume, grain-size distribution and the maximum height of deposition on the basin slopes are known. These parameters can be related to the precise channel morphology and mesotopography reveale
Authors
Anthony J. Bowen, William R. Normark, David J. W. Piper
Method for the systematic evaluation of organic chemical retention by solid phase extraction columns
No abstract available.
Authors
P. D. Capel, D.S. Barbeau
Mechanisms controlling the transport of organic chemicals in subsurface environments
No abstract available.
Authors
G. R. Aiken, P. D. Capel, E. T. Furlong, M. F. Hult, K. A. Thorn
Upper Triassic Barranca Group; Nonmarine and shallow-marine rift-basin deposits of northwestern Mexico
The 3,000-m-thick Upper Triassic Barranca Group in the Sierra de San Javier in east-central Sonora, Mexico, is composed, in ascending order, of the Arrayanes, Santa Clara, and Coyotes Formations. The Arrayanes and Santa Clara Formations are composed of fluvial and marine-delta deposits of quartzose and arkosic sandstone, conglomerate, shale, and siltstone; the Santa Clara Formation includes minor
Authors
John H. Stewart, Jaime Roldán-Quintana
Molluscan paleoecology and sedimentation patterns of the Cenomanian-Turonian extinction interval in the southern Colorado Plateau region
Lithology, carbonate and organic carbon geochemistry, and molluscan macrofauna were investigated in fine-grained clay-dominated strata spanning the Cenomanian-Turonian Stage boundary in the southern Colorado Plateau region. Analyses of these data show basinal and onshore to offshore changes in sedimentologic and molluscan assemblage trends through the upper Cenomanian Sciponoceras gracile and Neoc
Authors
William P. Elder
Assessing the solubilities and reaction kinetics of aluminous minerals in soils
The use of chemical thermodynamics and reaction kinetics is necessary to quantitatively model the transformation of aluminous minerals and their dissolved constituents in soils and other geochemical systems. Soils are thermodynamically open systems subject to atmospheric and biological forces and do not attain overall thermodynamic equilibrium with respect to either mass or time. However, local or
Authors
Howard M. May, D. Kirk Nordstrom
Tantilla bocourti (Gunther) Bocourt's Black-Headed Snake
No abstract available.
Authors
R.W. McDiarmid, S.H. Folke