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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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Age and evolution of the Precambrian crust of the Tobacco Root Mountains, Montana Age and evolution of the Precambrian crust of the Tobacco Root Mountains, Montana
U-Pb analyses of zircons from gneisses, anatectic leucosome, metasedimentary rocks, and a younger (metamorphosed) mafic dike from the Tobacco Root Mountains of southwestern Montana document a Precambrian history that extends from at least 3.90–1.77 Ga. The oldest U-Pb age reported here (3.8 Ga) is from a detrital zircon from a quartzite within the Spuhler Peak Metamorphic Suite, although...
Authors
Paul A. Mueller, Henry Robert Burger, Joseph L. Wooden, Ann L. Heatherington, David W. Mogk, Kimberly D’Arcy
Geochemistry of quartzofeldspathic gneisses and metamorphic mafic rocks of the Indian Creek and Pony–Middle Mountain Metamorphic Suites, Tobacco Root Mountains, Montana Geochemistry of quartzofeldspathic gneisses and metamorphic mafic rocks of the Indian Creek and Pony–Middle Mountain Metamorphic Suites, Tobacco Root Mountains, Montana
Quartzofeldspathic gneisses and metamorphic mafic rocks are the dominant lithologies in the Indian Creek and Pony–Middle Mountain Metamorphic Suites of the Tobacco Root Mountains. Field relations, geochemical discriminant analysis, and isotopic systematics indicate that these rocks derive from a bimodal volcanic suite ca. 3.3 Ga. The quartzofeldspathic gneisses contain sodic rocks of the...
Authors
David W. Mogk, Henry Robert Burger, Paul A. Mueller, Kimberly D’Arcy, Ann L. Heatherington, Joseph L. Wooden, Reyna L. Abeyta, Jennifer L. Martin, Lisa J. Jacob
American White Pelican (Pelecanus erythrorhynchos) American White Pelican (Pelecanus erythrorhynchos)
No abstract available.
Authors
F.L. Knopf
Appendix II. Formulae for selected materials used to isolate and study fungi and fungal allies Appendix II. Formulae for selected materials used to isolate and study fungi and fungal allies
No abstract available.
Authors
G.F. Bills, M.S. Foster
Appendix III. Institutions with significant collections of fungi or fungal allies and fungus-related websites Appendix III. Institutions with significant collections of fungi or fungal allies and fungus-related websites
No abstract available.
Authors
F.A. Wilkinson, M.S. Foster
Biological control of ticks Biological control of ticks
Ticks have numerous natural enemies, but only a few species have been evaluated as tick biocontrol agents (BCAs). Some laboratory results suggest that several bacteria are pathogenic to ticks, but their mode of action and their potential value as biocontrol agents remain to be determined. The most promising entomopathogenic fungi appear to be Metarhizium anisopliae and Beauveria bassiana
Authors
M. Samish, H. Ginsberg, I. Glazer
Chapter 8 Petrogenesis and mineralogic residence of selected elements in the meade peak phosphatic shale member of the permian phosphoria formation, Southeast Idaho Chapter 8 Petrogenesis and mineralogic residence of selected elements in the meade peak phosphatic shale member of the permian phosphoria formation, Southeast Idaho
The Meade Peak Phosphatic Shale Member of the Permian Phosphoria Formation hosts the ore mined by the phosphate industry of southeast Idaho. It also hosts environmentally sensitive elements (ESE) such as Se, As, Hg, Ni, Cd, Zn, and Cr. Primary chemistry, elemental distribution patterns, and mineralogy within the Meade Peak were modified by element migration and possibly the introduction...
Authors
Richard I. Grauch, George A. Desborough, Gregory P. Meeker, A. L. Foster, Russell G. Tysdal, J. R. Herring, Heather A. Lowers, B. A. Ball, Robert A. Zielinski, E. A. Johnson
Chronostratigraphic and depositional sequences of the Fort Union formation (Paleocene), Williston Basin, North Dakota, South Dakota, and Montana Chronostratigraphic and depositional sequences of the Fort Union formation (Paleocene), Williston Basin, North Dakota, South Dakota, and Montana
The Fort Union Formation in the Williston Basin of North Dakota, South Dakota, and Montana comprises chronostratigraphic and depositional sequences of Paleocene age. Individual chronostratigraphic sequences are defined by palynostratigraphic (pollen and spore) biozones and radiometric (40Ar/39Ar) ages obtained from tonsteins or volcanic ash layers. Analyses of depositional sequences are...
Authors
Peter D. Warwick, Romeo M. Flores, Douglas J. Nichols, Edward C. Murphy
Comparative ecology and conservation priorities of swift and kit foxes Comparative ecology and conservation priorities of swift and kit foxes
No abstract available.
Authors
A. Moehrenschlager, B.L. Cypher, K. Ralls, R. List, M.A. Sovada
Ecogeomorphology of Spartina patens-dominated tidal marshes: Soil organic matter accumulation, marsh elevation dynamics, and disturbance Ecogeomorphology of Spartina patens-dominated tidal marshes: Soil organic matter accumulation, marsh elevation dynamics, and disturbance
Marsh soil development and vertical accretion in Spartina patens (Aiton) Muhl.-dominated tidal marshes is largely dependent on soil organic matter accumulation from root-rhizome production and litter deposition. Yet there are few quantitative data sets on belowground production and the relationship between soil organic matter accumulation and soil elevation dynamics for this marsh type...
Authors
Donald R. Cahoon, M.A. Ford, P.F. Hensel
Ecological patterns and environmental change in the Bandelier landscape Ecological patterns and environmental change in the Bandelier landscape
No abstract available.
Authors
Craig D. Allen