Floyd Gray (Former Employee)
Science and Products
Filter Total Items: 18
Filter Total Items: 58
Developing an ecosystem services online decision support tool to assess the impacts of climate change and urban growth in the Santa Cruz watershed: Where we live, work, and play Developing an ecosystem services online decision support tool to assess the impacts of climate change and urban growth in the Santa Cruz watershed: Where we live, work, and play
Using respective strengths of the biological, physical, and social sciences, we are developing an online decision support tool, the Santa Cruz Watershed Ecosystem Portfolio Model (SCWEPM), to help promote the use of information relevant to water allocation and land management in a binational watershed along the U.S.-Mexico border. The SCWEPM will include an ES valuation system within a...
Authors
Laura M. Norman, Nita Tallent-Halsell, William Labiosa, Matt Weber, Amy McCoy, Katie Hirschboeck, James B. Callegary, Charles van Riper, Floyd Gray
Understanding Metal Pathways in Mineralized Ecosystems Understanding Metal Pathways in Mineralized Ecosystems
Successful management of ecosystems containing historical mine wastes requires understanding of processes that are responsible for the distribution, concentration, and bioavailability of potentially toxic elements. U.S. Geological Survey (USGS) scientists recently completed several investigations at historical mine sites in the western United States. These investigations have improved...
Authors
Laurie S. Balistrieri, Andrea L. Foster, Larry P. Gough, Floyd Gray, James J. Rytuba, Lisa L. Stillings
Digital soils survey map of the Patagonia Mountains, Arizona Digital soils survey map of the Patagonia Mountains, Arizona
The ‘Soil Survey of Santa Cruz and Parts of Cochise and Pima Counties, Arizona,' a product of the USDA’s Soil Conservation Service and the Forest Service in cooperation with the Arizona Agricultural Experiment Station, released in 1979, was created according to the site conditions in 1971, when soil scientists identified soils types on aerial photographs. The
Authors
Laura Norman, Craig Wissler, D. Phillip Guertin, Floyd Gray
Preliminary United States-Mexico border watershed analysis, twin cities area of Nogales, Arizona and Nogales, Sonora Preliminary United States-Mexico border watershed analysis, twin cities area of Nogales, Arizona and Nogales, Sonora
The United States - Mexico border area faces the challenge of integrating aspects of its binational physical boundaries to form a unified or, at least, compatible natural resource management plan. Specified geospatial components such as stream drainages, mineral occurrences, vegetation, wildlife, and land-use can be analyzed in terms of their overlapping impacts upon one another...
Authors
Laura Margaret Brady, Floyd Gray, Mario Castaneda, Mark Bultman, Karen Sue Bolm
Growth and abundance of Pacific Sand Lance, Ammodytes hexapterus, under differing oceanographic regimes Growth and abundance of Pacific Sand Lance, Ammodytes hexapterus, under differing oceanographic regimes
Dramatic changes in seabird and marine mammal stocks in the Gulf of Alaska have been linked to shifts in abundance and composition of forage fish stocks over the past 20 years. The relative value (e.g., size and condition of individual fish, abundance) of specific forage fish stocks to predators under temporally changing oceanographic regimes is also expected to vary. We inferred...
Authors
Martin D. Robards, Floyd Gray, John F. Piatt
Spatial variability of sediment erosion processes using GIS analysis within watersheds in a historically mined region, Patagonia Mountains, Arizona Spatial variability of sediment erosion processes using GIS analysis within watersheds in a historically mined region, Patagonia Mountains, Arizona
In this study, a geographic information system (GIS) is used to integrate and accurately map field studies, information from remotely sensed data, watershed models, and the dispersion of potentially toxic mine waste and tailings. The purpose of this study is to identify erosion rates and net sediment delivery of soil and mine waste/tailings to the drainage channel within several...
Authors
Laura M. Brady, Floyd Gray, Craig A. Wissler, D. Phillip Guertin
Processed Thematic Mapper Satellite Imagery for Selected Areas within the U.S.-Mexico Borderlands Processed Thematic Mapper Satellite Imagery for Selected Areas within the U.S.-Mexico Borderlands
The study is summarized in the Adobe Acrobat Portable Document Format (PDF) file OF00-309.PDF. This publication also contain satellite full-scene images of selected areas along the U.S.-Mexico border. These images are presented as high-resolution images in jpeg format (IMAGES). The folder LOCATIONS in contains TIFF images showing exact positions of easily-identified reference locations...
Authors
John C. Dohrenwend, Floyd Gray, Robert J. Miller
Field trip guide to selected studies of the Southwest Mineral and Environmental Investigations Project in southeastern Arizona Field trip guide to selected studies of the Southwest Mineral and Environmental Investigations Project in southeastern Arizona
The Southwest Mineral and Environmental Investigations Project is designed to address issues raised by rapid urban development in the basins of the southwestern U.S. These issues require objective geoscientific data that can be used by land managers and stakeholders to develop informed land and water use strategies. The project integrates new and existing geologic, geophysical, and...
Authors
B. B. Houser, M. E. Gettings, M.W. Bultman, Floyd Gray, K.R. Caruthers, D.M. Hirschberg
Geology and mineral resource assessment of the Venezuelan Guayana Shield at 1:500,000 scale; a digital representation of maps published by the U.S. Geological Survey Geology and mineral resource assessment of the Venezuelan Guayana Shield at 1:500,000 scale; a digital representation of maps published by the U.S. Geological Survey
This CD-ROM contains vector-based digital maps of the geology and resource assessment of the Venezuela Guayana Shield originally published as paper maps in 1993 in U. S. Geological Survey Bulletin 2062, at a scale of 1:1 million and revised in 1993-95 as separate maps at a scale of 1:500,000. Although the maps on this disc can be displayed at different scales, they are not intended to be...
Authors
Paul G. Schruben, J. C. Wynn, Floyd Gray, D. P. Cox, J.H. Sterwart, W. E. Brooks
Nonfuel mineral resources in the United States-Mexico border region: A progress report on information available from the Center for Inter-American Mineral Resource Investigations (CIMRI) Nonfuel mineral resources in the United States-Mexico border region: A progress report on information available from the Center for Inter-American Mineral Resource Investigations (CIMRI)
The exploitation of minerals has played a significant role in population growth and development of the U.S.Mexico border region. Recent proposed changes in regulations related to mining in the United States and changes in mining and investment regulations in Mexico have led to increased mineral exploration and development in Mexico, especially in the border region. As a preliminary step...
Authors
G. J. Orris, N.J. Page, J. G. Staude, K. S. Bolm, M. M. Carbonaro, Floyd Gray, K. R. Long
Petrology, mineralogy, and geochemistry of the Lower Coon Mountain Pluton, Northern California, with respect to the distribution of platinum-group elements Petrology, mineralogy, and geochemistry of the Lower Coon Mountain Pluton, Northern California, with respect to the distribution of platinum-group elements
No abstract available.
Authors
Norman J. Page, Floyd Gray, Andrew Griscom
Distribution of mineral deposits in the United States - Mexico border region Distribution of mineral deposits in the United States - Mexico border region
No abstract available.
Authors
G. J. Orris, K. S. Bolm, Marguerite Carbonaro, Floyd Gray, K. R. Long, N.J. Page, J.M.G. Staude, Tina Wells
Science and Products
Filter Total Items: 18
Filter Total Items: 58
Developing an ecosystem services online decision support tool to assess the impacts of climate change and urban growth in the Santa Cruz watershed: Where we live, work, and play Developing an ecosystem services online decision support tool to assess the impacts of climate change and urban growth in the Santa Cruz watershed: Where we live, work, and play
Using respective strengths of the biological, physical, and social sciences, we are developing an online decision support tool, the Santa Cruz Watershed Ecosystem Portfolio Model (SCWEPM), to help promote the use of information relevant to water allocation and land management in a binational watershed along the U.S.-Mexico border. The SCWEPM will include an ES valuation system within a...
Authors
Laura M. Norman, Nita Tallent-Halsell, William Labiosa, Matt Weber, Amy McCoy, Katie Hirschboeck, James B. Callegary, Charles van Riper, Floyd Gray
Understanding Metal Pathways in Mineralized Ecosystems Understanding Metal Pathways in Mineralized Ecosystems
Successful management of ecosystems containing historical mine wastes requires understanding of processes that are responsible for the distribution, concentration, and bioavailability of potentially toxic elements. U.S. Geological Survey (USGS) scientists recently completed several investigations at historical mine sites in the western United States. These investigations have improved...
Authors
Laurie S. Balistrieri, Andrea L. Foster, Larry P. Gough, Floyd Gray, James J. Rytuba, Lisa L. Stillings
Digital soils survey map of the Patagonia Mountains, Arizona Digital soils survey map of the Patagonia Mountains, Arizona
The ‘Soil Survey of Santa Cruz and Parts of Cochise and Pima Counties, Arizona,' a product of the USDA’s Soil Conservation Service and the Forest Service in cooperation with the Arizona Agricultural Experiment Station, released in 1979, was created according to the site conditions in 1971, when soil scientists identified soils types on aerial photographs. The
Authors
Laura Norman, Craig Wissler, D. Phillip Guertin, Floyd Gray
Preliminary United States-Mexico border watershed analysis, twin cities area of Nogales, Arizona and Nogales, Sonora Preliminary United States-Mexico border watershed analysis, twin cities area of Nogales, Arizona and Nogales, Sonora
The United States - Mexico border area faces the challenge of integrating aspects of its binational physical boundaries to form a unified or, at least, compatible natural resource management plan. Specified geospatial components such as stream drainages, mineral occurrences, vegetation, wildlife, and land-use can be analyzed in terms of their overlapping impacts upon one another...
Authors
Laura Margaret Brady, Floyd Gray, Mario Castaneda, Mark Bultman, Karen Sue Bolm
Growth and abundance of Pacific Sand Lance, Ammodytes hexapterus, under differing oceanographic regimes Growth and abundance of Pacific Sand Lance, Ammodytes hexapterus, under differing oceanographic regimes
Dramatic changes in seabird and marine mammal stocks in the Gulf of Alaska have been linked to shifts in abundance and composition of forage fish stocks over the past 20 years. The relative value (e.g., size and condition of individual fish, abundance) of specific forage fish stocks to predators under temporally changing oceanographic regimes is also expected to vary. We inferred...
Authors
Martin D. Robards, Floyd Gray, John F. Piatt
Spatial variability of sediment erosion processes using GIS analysis within watersheds in a historically mined region, Patagonia Mountains, Arizona Spatial variability of sediment erosion processes using GIS analysis within watersheds in a historically mined region, Patagonia Mountains, Arizona
In this study, a geographic information system (GIS) is used to integrate and accurately map field studies, information from remotely sensed data, watershed models, and the dispersion of potentially toxic mine waste and tailings. The purpose of this study is to identify erosion rates and net sediment delivery of soil and mine waste/tailings to the drainage channel within several...
Authors
Laura M. Brady, Floyd Gray, Craig A. Wissler, D. Phillip Guertin
Processed Thematic Mapper Satellite Imagery for Selected Areas within the U.S.-Mexico Borderlands Processed Thematic Mapper Satellite Imagery for Selected Areas within the U.S.-Mexico Borderlands
The study is summarized in the Adobe Acrobat Portable Document Format (PDF) file OF00-309.PDF. This publication also contain satellite full-scene images of selected areas along the U.S.-Mexico border. These images are presented as high-resolution images in jpeg format (IMAGES). The folder LOCATIONS in contains TIFF images showing exact positions of easily-identified reference locations...
Authors
John C. Dohrenwend, Floyd Gray, Robert J. Miller
Field trip guide to selected studies of the Southwest Mineral and Environmental Investigations Project in southeastern Arizona Field trip guide to selected studies of the Southwest Mineral and Environmental Investigations Project in southeastern Arizona
The Southwest Mineral and Environmental Investigations Project is designed to address issues raised by rapid urban development in the basins of the southwestern U.S. These issues require objective geoscientific data that can be used by land managers and stakeholders to develop informed land and water use strategies. The project integrates new and existing geologic, geophysical, and...
Authors
B. B. Houser, M. E. Gettings, M.W. Bultman, Floyd Gray, K.R. Caruthers, D.M. Hirschberg
Geology and mineral resource assessment of the Venezuelan Guayana Shield at 1:500,000 scale; a digital representation of maps published by the U.S. Geological Survey Geology and mineral resource assessment of the Venezuelan Guayana Shield at 1:500,000 scale; a digital representation of maps published by the U.S. Geological Survey
This CD-ROM contains vector-based digital maps of the geology and resource assessment of the Venezuela Guayana Shield originally published as paper maps in 1993 in U. S. Geological Survey Bulletin 2062, at a scale of 1:1 million and revised in 1993-95 as separate maps at a scale of 1:500,000. Although the maps on this disc can be displayed at different scales, they are not intended to be...
Authors
Paul G. Schruben, J. C. Wynn, Floyd Gray, D. P. Cox, J.H. Sterwart, W. E. Brooks
Nonfuel mineral resources in the United States-Mexico border region: A progress report on information available from the Center for Inter-American Mineral Resource Investigations (CIMRI) Nonfuel mineral resources in the United States-Mexico border region: A progress report on information available from the Center for Inter-American Mineral Resource Investigations (CIMRI)
The exploitation of minerals has played a significant role in population growth and development of the U.S.Mexico border region. Recent proposed changes in regulations related to mining in the United States and changes in mining and investment regulations in Mexico have led to increased mineral exploration and development in Mexico, especially in the border region. As a preliminary step...
Authors
G. J. Orris, N.J. Page, J. G. Staude, K. S. Bolm, M. M. Carbonaro, Floyd Gray, K. R. Long
Petrology, mineralogy, and geochemistry of the Lower Coon Mountain Pluton, Northern California, with respect to the distribution of platinum-group elements Petrology, mineralogy, and geochemistry of the Lower Coon Mountain Pluton, Northern California, with respect to the distribution of platinum-group elements
No abstract available.
Authors
Norman J. Page, Floyd Gray, Andrew Griscom
Distribution of mineral deposits in the United States - Mexico border region Distribution of mineral deposits in the United States - Mexico border region
No abstract available.
Authors
G. J. Orris, K. S. Bolm, Marguerite Carbonaro, Floyd Gray, K. R. Long, N.J. Page, J.M.G. Staude, Tina Wells