Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16909
U. S. Geological Survey programs in Pennsylvania U. S. Geological Survey programs in Pennsylvania
The U.S. Geological Survey (USGS) is involved in mapping and studying land, mineral, biological, and water resources and determining the risk from earthquakes and other natural hazards, which are of importance to the citizens of Pennsylvania. This Fact Sheet describes how the USGS is addressing some of the major environmental issues in Pennsylvania, which include availability of mineral...
Authors
Water Resources Division U.S. Geological Survey
Chestnut-sided warbler, Dendroica pensylvanica Chestnut-sided warbler, Dendroica pensylvanica
No abstract available.
Authors
C.S. Robbins
Brown creeper, Certhia americana Brown creeper, Certhia americana
No abstract available.
Authors
C.S. Robbins
Ground-water quality and its relation to hydrogeology, land use, and surface-water quality in the Red Clay Creek basin, Piedmont Physiographic Province, Pennsylvania and Delaware Ground-water quality and its relation to hydrogeology, land use, and surface-water quality in the Red Clay Creek basin, Piedmont Physiographic Province, Pennsylvania and Delaware
The Red Clay Creek Basin in the Piedmont Physiographic Province of Pennsylvania and Delaware is a 54-square-mile area underlain by a structurally complex assemblage of fractured metamorphosed sedimentary and igneous rocks that form a water-table aquifer. Ground-water-flow systems generally are local, and ground water discharges to streams. Both ground water and surface water in the basin...
Authors
Lisa A. Senior
Hydrogeology of, and simulation of ground-water flow in, a mantled carbonate-rock system, Cumberland Valley, Pennsylvania Hydrogeology of, and simulation of ground-water flow in, a mantled carbonate-rock system, Cumberland Valley, Pennsylvania
The U.S. Geological Survey conducted a study in a highly productive and complex regolith-mantled carbonate valley in the northeastern part of the Cumberland Valley, Pa., as part of its Appalachian Valleys and Piedmont Regional Aquifer-system Analysis program. The study was designed to quantify the hydrogeologic characteristics and understand the ground-water flow system of a highly...
Authors
D. C. Chichester
Viruses associated with diseases of walleye, sauger, and walleye x sauger hybrids Viruses associated with diseases of walleye, sauger, and walleye x sauger hybrids
No abstract available at this time
Authors
P. E. McAllister
Uranium-series disequilibrium, sedimentation, diatom frustules, and paleoclimate change in Lake Baikal Uranium-series disequilibrium, sedimentation, diatom frustules, and paleoclimate change in Lake Baikal
The large volume of water, approximately one-fifth of the total surface fresh water on the planet, contained in Lake Baikal in southeastern Siberia is distinguished by having a relatively high concentration of uranium (ca. 2 nM), and, together with the surface sediments, an unusually high234U238U alpha activity ratio of 1.95. About 80% of the input of uranium to the lake, with a234U238U...
Authors
D.N. Edgington, J. A. Robbins, Steven M. Colman, K.A. Orlandini, M.-P. Gustin
Behavioral changes associated with suboptimal prey densities for larval American shad Behavioral changes associated with suboptimal prey densities for larval American shad
Laboratory studies were conducted to determine the effects of suboptimal prey density and length of prey-deprivation period on swimming, feeding, and social behavior in larval American shad. Alosa sapidissima. Replicated prey-density treatments of 1,000, 500, and 0 Artemia nauplii/liter and deprivation periods of 0,2, and 4 days were established for an 8-day period. The duration or...
Authors
R. M. Ross, J. H. Johnson, R. M. Bennett, D. S. Dropkin
Sediment mass-flow processes on a depositional lobe, outer Mississippi Fan Sediment mass-flow processes on a depositional lobe, outer Mississippi Fan
SeaMARC 1A sidescan-sonar imagery and cores from the distal reaches of a depositional lobe on the Mississippi Fan show that channelized mass flow was the dominant mechanism for transport of silt and sand during the formation of this part of the fan. Sediments in these flows were rapidly deposited once outside of their confining channels. The mass flows most likely originated from slope...
Authors
W. C. Schwab, H.J. Lee, D.C. Twichell, J. Locat, C.H. Nelson, W.G. McArthur, Neil H. Kenyon
Sedimentary processes in a tectonically active region: Puerto Rico north insular slope Sedimentary processes in a tectonically active region: Puerto Rico north insular slope
No abstract available.
Authors
Kathryn M. Scanlon, Douglas G. Masson