Publications
These publications showcase the significant science conducted in our Science Centers.
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Appraisal of stream sedimentation in the Susquehanna River basin
The Susquehanna River presently transports about 3.0 million tons of sediment annually (110 tons per square mile). Only about 1.8 million tons of sediment enters the head of Chesapeake Bay annually because some sediment is trapped behind the power dams on the lower Susquehanna. Measured annual sediment yields from subbasins in the Susquehanna range from 40 to 440 tons per square mile. The highest
Authors
Kenneth F. Williams, Lloyd A. Reed
Water quality of streams in the Neshaminy Creek basin, Pennsylvania
The Neshaminy has carved a scenic route on its way to the Delaware River, thereby helping to increase the value of land. The unabated growth of nearby metropolitan areas and the multiplying needs for water and open space for water storage and recreation in southeastern Pennsylvania have become impelling forces that mark the Neshaminy valley watershed for continued development of its land and water
Authors
Edward F. McCarren
Definitions of selected ground-water terms, revisions and conceptual refinements
For many years there has been a need for redefinition or more precise definition of certain ground-water terms used in publications by members of the U.S . Geological Survey. Another problem has been the expression of the coefficient of permeability (herein redefined as hydraulic conductivity) and the coefficient of transmissibility (herein redefined as transmissivity) in inconsistent units that i
Authors
Stanley William Lohman
Residues of organochlorine pesticides, polychlorinated biphenyls, and mercury and autopsy data for bald eagles, 1969 and 1970
Thirty-nine bald eagles found sick or dead in 13 States during 1969 and 1970 were analyzed for pesticide residues. Residues of DDE, dieldrin, polychlorinated biphenyls (PCB's), and mercury were detected in all bald eagle carcasses; DDD residues were detected in 38; DDT, heptachlor epoxide, and dichlorobenzophenone (DCBP) were detected less frequently. Six eagles contained possible lethal levels of
Authors
Andre A. Belisle, William L. Reichel, Louis N. Locke, Thair Lamont, Bernard M. Mulhern, Richard M. Prouty, Robert B. DeWolf, Eugene Cromartie
Mercury in wild animals, Lake St. Clair, 1970
No abstract available.
Authors
E. H. Dustman, L. F. Stickel, J. B. Elder
Interstitial water studies on small core samples, deep sea drilling Project, leg 7
The sediments cored on Leg 7 are predominantly deep sea biogenic oozes and chalks; only rarely were significant quantities of pelagic clays and volcanic detritus encountered. The biogenic sections include both siliceous and calcareous deposits. At three sites the drilling terminated in basalt, one of which (Site 62) is interpreted as being intrusive on the basis of intense alteration of the overly
Authors
F.L. Sayles, Frank T. Manheim
Comparative acute oral toxicity of pesticides to six species of birds
Acute oral LD50 values were determined for 16 common pesticides on mallard ducks (Anas platyrhynchos), ring-necked pheasants (Phasianus colchicus), chukar partridges (Alectoris graeca), coturnix quail (Coturnix coturnix japonica), common pigeons (Columba livia), and house sparrows (Passer domesticus). Analyses of the data revealed that (1) the average sensitivity of any one species to the 16 pesti
Authors
Richard K. Tucker, M. A. Haegele
Foreign literature and translations in earth science
More than 50 percent of the total abstracted geologic literature is in Russian, followed by English at about 30 percent, and French, German, and Japanese from about 8 to 2 percent. Communist Chinese publications ceased as a result of the Cultural Revolution and have not resumed. Less than 2 percent of American earth scientists read and use Russian literature in the original to any significant exte
Authors
Frank T. Manheim
Interstitial water studies on small core samples, Deep Sea Drilling Project, Leg 8
Leg 8 sites are dominated by siliceous-calcareous biogenic oozes having depositional rates of 0.1 to 1.5 cm/1000 years. Conservative constituents of pore fluids showed, as have cores from other pelagic areas of the Pacific, insignificant or marginally significant changes with depth and location. However, in Sites 70 and 71, calcium, magnesium and strontium showed major shifts in concentration with
Authors
F. T. Manheim, F.L. Sayles
Changes in mineral composition of eggshells from black ducks and mallards fed DDE in the diet
No abstract available.
Authors
J. R. Longcore, F. B. Samson, J.F. Kreitzer, J. W. Spann
Hazards of mercury: Special report to the secretary's pesticide advisory committee, department of health, education, and welfare, November 1970
No abstract available.
Authors
Norton Nelson, Theodore C. Byerly, Albert C. Kolbye, Leonard T. Kurland, Raymond E. Shapiro, Samuel L. Shibko, William H. Stickel, Jack E. Thompson, Lowell A. Van Den Berg, Alfred Weissler
Origin and emplacement of the ultramafic rocks of the Emigrant Gap area, California
The ultramafic bodies of the Emigrant Gap area are part of a mafic complex within a large composite pluton of the northern Sierra Nevada. The pluton was magmatically emplaced and is surrounded by an aureole of hornblende-hornfels facies rocks. Inclusions of country rock in ultramafic rock are of pyroxene-hornfels facies and appear to have been partly melted. Gravity studies indicate that the ultra
Authors
O.B. James