Larry Brown (Former Employee)
Science and Products
Filter Total Items: 125
Spatial, seasonal and diel distribution of fishes in a California reservoir dominated by native fishes Spatial, seasonal and diel distribution of fishes in a California reservoir dominated by native fishes
During 21 months of sampling with various techniques, we captured 24 species of fish in Britton Reservoir. Nine species comprised over 96% of the number of fish captured and approximately 88% of the biomass. Five native non-game species accounted for over 77% of the catches. The native non-game fishes have maintained large populations in the reservoir despite continued introductions of...
Authors
Bruce Vondracek, Donald Baltz, Larry Brown, Peter Moyle
Detection of erosion events using 10Be profiles: example of the impact of agriculture on soil erosion in the Chesapeake Bay area (U.S.A.) Detection of erosion events using 10Be profiles: example of the impact of agriculture on soil erosion in the Chesapeake Bay area (U.S.A.)
10Be concentration, total carbon and grain-size were measured in cores collected in undisturbed estuarine sediments of three tributaries of the Chesapeake Bay. These cores were previously studied by Davis [1] and Brush [2,3] for pollen content, age and sedimentation rate. In this work, we compare the results obtained for these various analyses. In the cores, we observed two increases...
Authors
J. N. Valette-Silver, L. Brown, M. Pavich, J. Klein, R. Middleton
10Be distribution in soils from Merced River terraces, California 10Be distribution in soils from Merced River terraces, California
The distribution and residence time of cosmogenic 10Be in clay-rich soil horizons is fundamental to understanding and modelling the migration of 10Be on terrestrial sediments and in groundwater solutions. We have analyzed seven profiles of clay-rich soils developed from terrace sediments of the Merced River, California. The terraces and soils of increasing age are used to compare the...
Authors
M.J. Pavich, L. Brown, J. Harden, J. Klein, R. Middleton
10Be accumulation in a soil chronosequence 10Be accumulation in a soil chronosequence
We have measured the concentration of the cosmogenic isotope10Be in soil samples from various horizons at six sites, including three independently dated Rappahannock River terraces and a previously undated Piedmont soil to which we have assigned an age. All of the incident10Be can be accounted for in one of these soils and a second is within a factor of two. In three soils, whose...
Authors
M.J. Pavich, L. Brown, J. Klein, R. Middleton
Studies related to the Charleston, South Carolina, earthquake of 1886 — Tectonics and seismicity Studies related to the Charleston, South Carolina, earthquake of 1886 — Tectonics and seismicity
Since 1973, the U.S. Geological Survey (USGS), with support from the Nuclear Regulatory Commission, has conducted extensive investigations of the tectonic and seismic history of the Charleston, S.C., earthquake zone and surrounding areas. The goal of these investigations has been to discover the cause of the large intraplate Charleston earthquake of 1886, which dominates the record of...
Authors
David Gottfried, C. Annell, G. Byerly, Marvin Lanphere, Jeffrey Phillips, Gregory S. Gohn, Brenda Houser, Ray Schneider, Hans Ackermann, B. Yantis, John Costain, F. Schilt, Larry Brown, Jack Oliver, Sidney Kaufman, Robert Hamilton, John Behrendt, V. Henry, Kenneth Bayer, David Daniels, Isidore Zietz, Peter Popenoe, T. Chowns, C. Williams, Robert Dooley, J. Wampler, William Dillon, Kim Klitgord, Charles Paull, Lyle McGinnis, James Dewey, Arthur Tarr, Susan Rhea, Carl Wentworth, Marcia Mergner-Keefer, G. Bollinger
Science and Products
Filter Total Items: 125
Spatial, seasonal and diel distribution of fishes in a California reservoir dominated by native fishes Spatial, seasonal and diel distribution of fishes in a California reservoir dominated by native fishes
During 21 months of sampling with various techniques, we captured 24 species of fish in Britton Reservoir. Nine species comprised over 96% of the number of fish captured and approximately 88% of the biomass. Five native non-game species accounted for over 77% of the catches. The native non-game fishes have maintained large populations in the reservoir despite continued introductions of...
Authors
Bruce Vondracek, Donald Baltz, Larry Brown, Peter Moyle
Detection of erosion events using 10Be profiles: example of the impact of agriculture on soil erosion in the Chesapeake Bay area (U.S.A.) Detection of erosion events using 10Be profiles: example of the impact of agriculture on soil erosion in the Chesapeake Bay area (U.S.A.)
10Be concentration, total carbon and grain-size were measured in cores collected in undisturbed estuarine sediments of three tributaries of the Chesapeake Bay. These cores were previously studied by Davis [1] and Brush [2,3] for pollen content, age and sedimentation rate. In this work, we compare the results obtained for these various analyses. In the cores, we observed two increases...
Authors
J. N. Valette-Silver, L. Brown, M. Pavich, J. Klein, R. Middleton
10Be distribution in soils from Merced River terraces, California 10Be distribution in soils from Merced River terraces, California
The distribution and residence time of cosmogenic 10Be in clay-rich soil horizons is fundamental to understanding and modelling the migration of 10Be on terrestrial sediments and in groundwater solutions. We have analyzed seven profiles of clay-rich soils developed from terrace sediments of the Merced River, California. The terraces and soils of increasing age are used to compare the...
Authors
M.J. Pavich, L. Brown, J. Harden, J. Klein, R. Middleton
10Be accumulation in a soil chronosequence 10Be accumulation in a soil chronosequence
We have measured the concentration of the cosmogenic isotope10Be in soil samples from various horizons at six sites, including three independently dated Rappahannock River terraces and a previously undated Piedmont soil to which we have assigned an age. All of the incident10Be can be accounted for in one of these soils and a second is within a factor of two. In three soils, whose...
Authors
M.J. Pavich, L. Brown, J. Klein, R. Middleton
Studies related to the Charleston, South Carolina, earthquake of 1886 — Tectonics and seismicity Studies related to the Charleston, South Carolina, earthquake of 1886 — Tectonics and seismicity
Since 1973, the U.S. Geological Survey (USGS), with support from the Nuclear Regulatory Commission, has conducted extensive investigations of the tectonic and seismic history of the Charleston, S.C., earthquake zone and surrounding areas. The goal of these investigations has been to discover the cause of the large intraplate Charleston earthquake of 1886, which dominates the record of...
Authors
David Gottfried, C. Annell, G. Byerly, Marvin Lanphere, Jeffrey Phillips, Gregory S. Gohn, Brenda Houser, Ray Schneider, Hans Ackermann, B. Yantis, John Costain, F. Schilt, Larry Brown, Jack Oliver, Sidney Kaufman, Robert Hamilton, John Behrendt, V. Henry, Kenneth Bayer, David Daniels, Isidore Zietz, Peter Popenoe, T. Chowns, C. Williams, Robert Dooley, J. Wampler, William Dillon, Kim Klitgord, Charles Paull, Lyle McGinnis, James Dewey, Arthur Tarr, Susan Rhea, Carl Wentworth, Marcia Mergner-Keefer, G. Bollinger
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government