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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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Zircon geochronology of Precambrian rocks in southeastern Wyoming and northern Colorado Zircon geochronology of Precambrian rocks in southeastern Wyoming and northern Colorado
Archean gneisses and Early Proterozoic metasedimentary rocks of the Wyoming Province are separated from Proterozoic eugeoclinal metamorphic rocks by a major east-west–trending shear zone called the Cheyenne belt. U-Pb zircon ages of Archean tonalites north of the Cheyenne belt denote an intrusive event at 2,700 Ma. Detrital zircons from Proterozoic metasedimentary rocks north of the...
Authors
Wayne R. Premo, W. R. Van Schmus
Transport and degradation of water-soluble creosote-derived compounds Transport and degradation of water-soluble creosote-derived compounds
Creosote is the most extensively used insecticide and industrial wood preservative today. It is estimated that there are more than 600 wood-preserving plants in the United States, and their collective use of creosote exceeds 4.5xl06 kg/yr (von Rumker et al., 1975). Creosote is a complex mixture of more than 200 major individual organic compounds with differing molecular weights...
Authors
E. Michael Godsy, D.F. Goerlitz, Dunja Grbic-Galic
Partition and adsorption on soil and mobility of organic pollutants and pesticides Partition and adsorption on soil and mobility of organic pollutants and pesticides
The mechanism for sorption of organic pollutants and pesticides by soil has long been a subject of profound interest because of its direct impacts on the mobility and activity of the compounds in soil. Although a large volume of laboratory and field data on many aspects of soil behavior had been gathered between the 1950s and 1970s, during which period the use of organic pesticides was...
Authors
C. T. Chiou
Allelopathy and the fire induced herb cycle, Allelopathy and the fire induced herb cycle,
No abstract available.
Authors
Jon E. Keeley, S.C. Keeley
Rice prairies Rice prairies
Pesticide contamination of rice prairie waterfowl habitat and acute pesticide poisoning of wintering and migrating waterfowl on the rice prairies has been reduced in recent years. Some problems still exist.
Authors
W.C. Hobaugh, C.D. Stutzenbaker, Edward L. Flickinger
Aqueous equilibrium data for a mononuclear aluminum species Aqueous equilibrium data for a mononuclear aluminum species
No abstract available.
Authors
D. Kirk Nordstrom, Howard M. May
Methanogenesis in hypersaline environments Methanogenesis in hypersaline environments
No abstract available.
Authors
Ronald S. Oremland, G.M. King
Thermal and cementation histories of Permian shelf-edge carbonate rocks in the Nanpanjiang Basin, South China Thermal and cementation histories of Permian shelf-edge carbonate rocks in the Nanpanjiang Basin, South China
As of 1984, the Nanpanjiang Basin of South China has had almost no exploration by drilling although oil seeps exist among its margins and producing wells occur in adjacent basins. however, cooperative studies by petroleum geologists and geochemists of the United States and the People's Republic of China (1982-1984) show that calcite-cemented reef and fore-reef carbonate rocks near Ziyun...
Authors
Robert B. Halley, Judith T. Parrish, Xie Zahn, Hu Wenhai, Peter A. Scholle, Su Zhongrui, Zhang Yirong, Huang Yunming, Li Guangxuan
Gopherus agassizii: Desert tortoise Gopherus agassizii: Desert tortoise
The desert tortoise is one of four allopatric North American tortoises. It occurs in the Mojave and Sonoran deserts of the southwestern United States and Mexico. Auffenberg (1976) divided the genus Gopherus (consisting of four species, G. agassizi, G. berlandieri, G.flavomarginatus, and G. polyphemus) in two osteological groups. Bramble (1982), using morphological and palaeontological...
Authors
Kristen H. Berry
A coded tracking telemetry system A coded tracking telemetry system
We describe the general characteristics of an automated radio telemetry system designed to operate for prolonged periods on a single frequency. Each transmitter sends a unique coded signal to a receiving system that encodes and records only the appropriater, pre-programmed codes. A record of the time of each reception is stored on diskettes in a micro-computer. This system enables...
Authors
P.W. Howey, W.S. Seegar, M.R. Fuller, K. Titus