Conference Papers
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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 almost 5,000 conference papers authored by our scientists and refine search by topic, location, year, and advanced search.
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The Reimer Diatom Herbarium: An important resource for teaching and research The Reimer Diatom Herbarium: An important resource for teaching and research
The Reimer Diatom Herbarium (ILH) at Iowa Lakeside Laboratory (ILL), a field station of Iowa's state universities, contains 3,280 permanent diatom slides of collections made from prairie potholes, alkaline fens, acid bogs, eutrophic lakes, saline lakes, Pleistocene paleolakes, and Miocene fossil deposits near ILL. The herbarium has a focus on collections made within Dickinson County, a...
Authors
S.J. Rushforth, M.B. Edlund, S. A. Spaulding, E. F. Stoermer
Transient electromagnetic mapping of clay units in the San Luis Valley, Colorado Transient electromagnetic mapping of clay units in the San Luis Valley, Colorado
Transient electromagnetic soundings were used to obtain information needed to refine hydrologic models of the San Luis Valley, Colorado. The soundings were able to map an aquitard called the blue clay that separates an unconfined surface aquifer from a deeper confined aquifer. The blue clay forms a conductor with an average resistivity of 6.9 ohm‐m. Above the conductor are found a...
Authors
David V. Fitterman, V. J. S. Grauch
Use of induced polarization to characterize the hydrogeologic framework of the zone of surface‐water/groundwater exchange at the Hanford 300 Area, WA Use of induced polarization to characterize the hydrogeologic framework of the zone of surface‐water/groundwater exchange at the Hanford 300 Area, WA
An extensive continuous waterborne electrical imaging (CWEI) survey was conducted along the Columbia River corridor adjacent to the U.S. Department of Energy (DOE) Hanford 300 Area, WA, in order to improve the conceptual model for exchange between surface water and U‐contaminated groundwater. The primary objective was to determine spatial variability in the depth to the Hanford‐Ringold...
Authors
Lee Slater, Dimitrios Ntarlagiannis, Frederick D. Day-Lewis, Kisa Mwakanyamale, John W. Lane, Andy Ward, Roelof J. Versteeg
Using airborne geophysical surveys to improve groundwater resource management models Using airborne geophysical surveys to improve groundwater resource management models
Increasingly, groundwater management requires more accurate hydrogeologic frameworks for groundwater models. These complex issues have created the demand for innovative approaches to data collection. In complicated terrains, groundwater modelers benefit from continuous high‐resolution geologic maps and their related hydrogeologic‐parameter estimates. The USGS and its partners have...
Authors
Jared D. Abraham, James C. Cannia, Steven M. Peterson, Bruce D. Smith, Burke J. Minsley, Paul A. Bedrosian
Using GIS and Google Earth for the creation of the Going-to-the-Sun Road Avalanche Atlas, Glacier National Park, Montana, USA Using GIS and Google Earth for the creation of the Going-to-the-Sun Road Avalanche Atlas, Glacier National Park, Montana, USA
Snow avalanche paths are key geomorphologic features in Glacier National Park, Montana, and an important component of mountain ecosystems: they are isolated within a larger ecosystem, they are continuously disturbed, and they contain unique physical characteristics (Malanson and Butler, 1984). Avalanches impact subalpine forest structure and function, as well as overall biodiversity...
Authors
Erich H. Peitzsch, Daniel B. Fagre, Mark Dundas
Water-level conditions in selected confined aquifers of the New Jersey and Delaware Coastal Plain Water-level conditions in selected confined aquifers of the New Jersey and Delaware Coastal Plain
No abstract available
Authors
Vincent T. DePaul, Robert Rosman, Pierre Lacombe
Changes in the global water cycle Changes in the global water cycle
No abstract available
Authors
D.P. Lettenmaier, V. Aizen, A. Amani, T. Bohn, F. Giorgi, S. Harrison, Thomas G. Huntington, R. Lawford, P. Letitre, H. Lins, J. Magomi, G-K. Park, I. Severskiy, W.J. Shuttleworth, P. Singh, S. Sorooshian, W. Struckmeier, K. Takeuchi, L. Tallaksen, C. Vorosmarty, Tandorig Yan, T. Zhang
Deglaciation in the southeastern Laurentide Sector and the Hudson Valley – 15,000 Years of vegetational and climate history Deglaciation in the southeastern Laurentide Sector and the Hudson Valley – 15,000 Years of vegetational and climate history
In this field trip, we provide a review of the significant controversy concerning the timing of deglaciation in the Hudson and Wallkill Valleys. We outline the differences in methodology and chronology with a circular route throughout the Hudson and Wallkill valleys. We begin the trip at Lake Mohonk near New Paltz led by Kirsten Menking and Dorothy Peteet, then continue to the “black...
Authors
Dorothy M. Peteet, John Rayburn, Kirsten M. Menking, Guy Robinson, Byron D. Stone
Road to the kingdom: A bedrock transect across the Pre-Silurian Rowe-Hawley Belt in central Vermont Road to the kingdom: A bedrock transect across the Pre-Silurian Rowe-Hawley Belt in central Vermont
No abstract available.
Authors
Jonathan Kim, Marjorie H. Gale, R. Coish, Jo Laird, Gregory J. Walsh
Identifying 5 years of land cover change across the nation: Updating NLCD 2001 to 2006 through image change detection Identifying 5 years of land cover change across the nation: Updating NLCD 2001 to 2006 through image change detection
No abstract available.
Authors
George Z. Xian, Collin G. Homer
The Shawangunk and Martinsburg Formations revisited; sedimentology, stratigraphy, mineralogy, geochemistry, structure and paleontology The Shawangunk and Martinsburg Formations revisited; sedimentology, stratigraphy, mineralogy, geochemistry, structure and paleontology
In southeastern New York Middle Silurian Shawangunk Formation (Figure 1), containing gray conglomerate, sandstone and shale, lies unconformably above the Ordovician Martinsburg Formation, consisting of shales and graywackes. In southwestern New York, near the Port Jervis area, The Shawangunk Formation is overlain by the Bloomsburg Red Beds, the same stratigraphic sequence that occurs in
Authors
H. R. Feldman, Jack B. Epstein, John A. Smoliga