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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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PB isotopes, ore deposits, and metallogenic terranes PB isotopes, ore deposits, and metallogenic terranes
No abstract available.
Authors
R. M. Tosdal, J. L. Wooden, R. M. Bouse
Hydrogeologic structure of the Newark Basin, Pennsylvania, from borehole geophysical logs Hydrogeologic structure of the Newark Basin, Pennsylvania, from borehole geophysical logs
The Brunswick and the underlying Lockatong Formations are comprised of littrifled Mesozoic sediments that constitute part of the Newark Basin in southeastern Pennsylvania (USA). These fractured rocks form an important regional aquifer that consists of gmdational sequences of shale, siltstone, and sandstone, with fluid transport occurring primarily in fractures. An extensive suite of...
Authors
R. H. Morin, L.A. Senior, E.R. Decker
Mechanical and thermal control of cleating and shearing in coal: examples from the Alabama coalbed methane field, USA Mechanical and thermal control of cleating and shearing in coal: examples from the Alabama coalbed methane field, USA
Natural fractures provide most of the interconnected macroporosity in coal. Therefore, understanding the characteristics of these fractures and the associated mechanisms of formation is essential for effective coalbed methane exploration and field management. Natural fractures in coal can be divided into two general types: cleat and shear structures. Cleat has been studied for more than...
Authors
Jack Pashin, R.E. Carroll, Joseph R. Hatch, Martin B. Goldhaber
Coal mining in the 21st century: Yampa coal field, northwest Colorado Coal mining in the 21st century: Yampa coal field, northwest Colorado
No abstract available.
Authors
Michael E. Brownfield, Edward A. Johnson, Ronald H. Affolter, Charles E. Barker
200,000 years of climate change recorded in eolian sediments of the High Plains of eastern Colorado and western Nebraska 200,000 years of climate change recorded in eolian sediments of the High Plains of eastern Colorado and western Nebraska
Loess and eolian sand cover vast areas of the western Great Plains of Nebraska, Kansas and Colorado (Fig. 1). In recent studies of Quaternary climate change, there has been a renewed interest in loess and eolian sand. Much of the attention now given to loess stems from new studies of long loess sequences that contain detailed records of Quaternary glacial-interglacial cycles, thought to...
Authors
Daniel R. Muhs, James B. Swinehart, David B. Loope, John N. Aleinikoff, Josh Been
Linkage between grain-size evolution and sediment depletion during Colorado River floods Linkage between grain-size evolution and sediment depletion during Colorado River floods
No abstract available.
Authors
David J. Topping, David M. Rubin, Jonathan M. Nelson, Paul J. Kinzel, James P. Bennett
Entrainment and transport of cobbles and boulders from debris fans Entrainment and transport of cobbles and boulders from debris fans
No abstract available.
Authors
James E. Pizzuto, Robert Webb, Peter G. Griffiths, John G. Elliott, Theodore S. Melis
The use of heat as a tracer to estimate recharge beneath streams and artificial recharge ponds The use of heat as a tracer to estimate recharge beneath streams and artificial recharge ponds
No abstract available.
Authors
James Constantz, Richard G. Niswonger, A.E. Stewart
Reworking of aggraded debris fans Reworking of aggraded debris fans
No abstract available.
Authors
Robert Webb, Theodore S. Melis, Peter G. Griffiths, John G. Elliott
The geochemistry of acid mine waters The geochemistry of acid mine waters
No abstract available.
Authors
D. Kirk Nordstrom, Charles N. Alpers