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Mark Bultman (Former Employee)

Science and Products

Image Collage of Landsat, pollinator, and volcanologist

Geophysical Imaging for Critical Mineral Resources in the Southern Basin and Range

Reliance on imports for many critical mineral commodities (including rare earth elements) puts the U.S. at high risk for supply disruption. Undiscovered deposits of some of these critical and strategic minerals undoubtedly exist in the United States, but a lack of modern geological, geophysical, and topographic data makes exploration challenging. This project plans to improve our knowledge of the...
By
Geology, Energy, and Minerals Mission Area, Mineral Resources Program, Geology, Minerals, Energy, and Geophysics Science Center
Geophysical Imaging for Critical Mineral Resources in the Southern Basin and Range

Geophysical Imaging for Critical Mineral Resources in the Southern Basin and Range

Reliance on imports for many critical mineral commodities (including rare earth elements) puts the U.S. at high risk for supply disruption. Undiscovered deposits of some of these critical and strategic minerals undoubtedly exist in the United States, but a lack of modern geological, geophysical, and topographic data makes exploration challenging. This project plans to improve our knowledge of the...
Learn More
USGS science for a changing world

Concealed Rare Earth Element (REE) Terranes in the Southern Basin and Range Geologic Province

We are working to develop an understanding of the types, sizes, and spatial distribution of rare-earth element (REE) related deposits in the Southern Basin and Range geologic province to help ensure the availability of REEs to industry in the United States. Geologic, geophysical, and geochemical data acquired will be used to develop permissive tracts for REE related deposits and to define areas of...
By
Mineral Resources Program, Geology, Minerals, Energy, and Geophysics Science Center
Concealed Rare Earth Element (REE) Terranes in the Southern Basin and Range Geologic Province

Concealed Rare Earth Element (REE) Terranes in the Southern Basin and Range Geologic Province

We are working to develop an understanding of the types, sizes, and spatial distribution of rare-earth element (REE) related deposits in the Southern Basin and Range geologic province to help ensure the availability of REEs to industry in the United States. Geologic, geophysical, and geochemical data acquired will be used to develop permissive tracts for REE related deposits and to define areas of...
Learn More
Image shows the Great Basin with a mountain in the background

Great Basin Metallogeny and Regional Structure - New Interpretations of Magnetic and Gravity Data

This project incorporates new geophysical technologies developed at the Tucson office of the Geology, Minerals, Energy, and Geophysics Science Center over the last 20 years for assessing mineral deposits concealed by basin sediments. These technologies include: textural classification of magnetic and magnetotelluric data and methods to characterize bedrock/basement lithologies, improved lineament...
By
Mineral Resources Program, Geology, Minerals, Energy, and Geophysics Science Center
Great Basin Metallogeny and Regional Structure - New Interpretations of Magnetic and Gravity Data

Great Basin Metallogeny and Regional Structure - New Interpretations of Magnetic and Gravity Data

This project incorporates new geophysical technologies developed at the Tucson office of the Geology, Minerals, Energy, and Geophysics Science Center over the last 20 years for assessing mineral deposits concealed by basin sediments. These technologies include: textural classification of magnetic and magnetotelluric data and methods to characterize bedrock/basement lithologies, improved lineament...
Learn More

Sopori Wash sub-basin gravity data, Pima and Santa Cruz Counties, Arizona Sopori Wash sub-basin gravity data, Pima and Santa Cruz Counties, Arizona

This data release contains new Earths gravity data from the Sopori Wash sub-basin in Pima and Santa Cruz Counties, Arizona. Data were acquired in January and March of 2017.
By
Geology, Minerals, Energy, and Geophysics Science Center

Database for the geologic map of the upper Santa Cruz River basin, southern Arizona Database for the geologic map of the upper Santa Cruz River basin, southern Arizona

This digital publication contains the database, base maps, and style files used to build the geologic map of the upper Santa Cruz River basin in southern Arizona published in U.S. Geological Survey Scientific Investigations Map 3490 (Page and others, 2023). Shapefiles are also included for the user’s convenience. In the database, there are polygon features outlining the map units and...
By
Geosciences and Environmental Change Science Center

Aeromagnetic and aeroradiometric data acquired over parts of the Trans-Pecos region of West Texas and Southern New Mexico Aeromagnetic and aeroradiometric data acquired over parts of the Trans-Pecos region of West Texas and Southern New Mexico

The Trans-Pecos region of West Texas and Southern New Mexico contains a series of rare earth element (REE) enriched ~ 34-36 Ma intrusive rhyolites and syenites. One such intrusive in the Sierra Blanca Mountains, Texas, hosts the Round Top REE deposit which is one of the few REE deposits in the U.S. with an economic evaluation and is scheduled to go into production in 2025. In addition...
By
Mineral Resources Program, Geology, Minerals, Energy, and Geophysics Science Center

GIS and Data Tables for Focus Areas for Potential Domestic Nonfuel Sources of Rare Earth Elements GIS and Data Tables for Focus Areas for Potential Domestic Nonfuel Sources of Rare Earth Elements

In response to Executive Order 13817 of December 20, 2017, the U.S. Geological Survey (USGS) coordinated with the Bureau of Land Management (BLM) to identify 35 nonfuel minerals or mineral materials considered critical to the economic and national security of the United States (U.S.). Acquiring information on possible domestic sources of these critical minerals is the basis of the USGS...
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center, Earth Mapping Resources Initiative (Earth MRI)

Geologic map and hydrogeologic investigations of the upper Santa Cruz River basin, southern Arizona Geologic map and hydrogeologic investigations of the upper Santa Cruz River basin, southern Arizona

This report includes an updated geologic map and cross sections of the upper Santa Cruz River basin, southern Arizona. The map and cross sections describe the geometry, thickness, and structure of the Miocene to Holocene units which form the main aquifers in the basin. The report also includes results of new hydrogeologic studies including (1) mapping and defining depth to bedrock based...
By
Geology, Minerals, Energy, and Geophysics Science Center, Geosciences and Environmental Change Science Center

Geologic map of the Rio Rico and Nogales 7.5’ quadrangles, Santa Cruz County, Arizona Geologic map of the Rio Rico and Nogales 7.5’ quadrangles, Santa Cruz County, Arizona

The Rio Rico and Nogales (Arizona) 1:24,000-scale quadrangles are located in the Basin and Range Province of southern Arizona, and the southern edge of the map is the international border with Sonora, Mexico. The major urban area is Nogales, a bi-national city known as “the gateway to Mexico.” Rocks exposed in the map area range in age from Jurassic through Quaternary. Major...
By
Groundwater and Streamflow Information Program, Geosciences and Environmental Change Science Center
Filter Total Items: 24

Geologic framework and hydrogeology of the Rio Rico and Nogales 7.5’ quadrangles, upper Santa Cruz Basin, Arizona, with three-dimensional hydrogeologic model Geologic framework and hydrogeology of the Rio Rico and Nogales 7.5’ quadrangles, upper Santa Cruz Basin, Arizona, with three-dimensional hydrogeologic model

Rapid population growth and declining annual recharge to aquifers in the upper Santa Cruz Basin area of southern Arizona, have increased the demand for additional groundwater resources. This demand is predicted to escalate in the future because of higher temperatures, longer droughts, less aquifer recharge, and decreased river and stream base flow. We conducted geologic studies to help...
Authors
William Page, Mark Bultman, D. Paco VanSistine, Christopher Menges, Floyd Gray, Michael Pantea
By
Groundwater and Streamflow Information Program, Geosciences and Environmental Change Science Center

Bedrock morphology and structure, upper Santa Cruz Basin, south-central Arizona, with transient electromagnetic survey data Bedrock morphology and structure, upper Santa Cruz Basin, south-central Arizona, with transient electromagnetic survey data

The upper Santa Cruz Basin is an important groundwater basin containing the regional aquifer for the city of Nogales, Arizona. This report provides data and interpretations of data aimed at better understanding the bedrock morphology and structure of the upper Santa Cruz Basin study area which encompasses the Rio Rico and Nogales 1:24,000-scale U.S. Geological Survey quadrangles. Data...
Authors
Mark Bultman, William Page
By
Geology, Energy, and Minerals Mission Area, Energy Resources Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Geology, Minerals, Energy, and Geophysics Science Center, Geosciences and Environmental Change Science Center

Hydrogeologic investigations of the Miocene Nogales Formation in the Nogales Area, Upper Santa Cruz Basin, Arizona Hydrogeologic investigations of the Miocene Nogales Formation in the Nogales Area, Upper Santa Cruz Basin, Arizona

Hydrogeologic investigations were conducted to evaluate the groundwater resource potential for the Miocene Nogales Formation in the Nogales area, southern Arizona. Results indicate that parts of the formation may provide new, deeper sources of groundwater for the area. Geologic mapping determined the hydrogeologic framework of the formation by defining lithologic, mineralogic, and...
Authors
William Page, Floyd Gray, Mark Bultman, Christopher Menges
By
Groundwater and Streamflow Information Program, Geosciences and Environmental Change Science Center

Detailed interpretation of aeromagnetic data from the Patagonia Mountains area, southeastern Arizona Detailed interpretation of aeromagnetic data from the Patagonia Mountains area, southeastern Arizona

The induced magnetic field and the remanent magnetic field of rock masses are important to geologic modeling based on Earth’s magnetic field data. The orientation of the induced magnetic field is approximately parallel to the orientation of Earth’s geomagnetic field and its intensity can be derived from measured magnetic susceptibilities of rocks in a study area. The orientation and...
Authors
Mark Bultman
By
Geology, Energy, and Minerals Mission Area, Energy Resources Program, Groundwater and Streamflow Information Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Geology, Minerals, Energy, and Geophysics Science Center

Magnetic susceptibility data for some exposed bedrock in the western conterminous United States Magnetic susceptibility data for some exposed bedrock in the western conterminous United States

In-place rock magnetic susceptibility measurements for 746 sites in the western conterminous United States are reported in a database. Of these 746 sites, 408 sites are in the Silverton Caldera area of the San Juan Mountains of southwestern Colorado. Of the 408 sites in the Silverton Caldera area, 106 sites are underground. The remaining 338 sites outside the Silverton Caldera area were...
Authors
Mark Gettings, Mark Bultman
By
Geology, Energy, and Minerals Mission Area, Energy Resources Program, Groundwater and Streamflow Information Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Geology, Minerals, Energy, and Geophysics Science Center

Investigation of the structure and lithology of bedrock concealed by basin fill, using ground-based magnetic-field-profile data acquired in the San Rafael Basin, southeastern Arizona Investigation of the structure and lithology of bedrock concealed by basin fill, using ground-based magnetic-field-profile data acquired in the San Rafael Basin, southeastern Arizona

Data on the Earth’s total-intensity magnetic field acquired near ground level and at measurement intervals as small as 1 m include information on the spatial distribution of nearsurface magnetic dipoles that in many cases are unique to a specific lithology. Such spatial information is expressed in the texture (physical appearance or characteristics) of the data at scales of hundreds of...
Authors
Mark Bultman
By
Geology, Energy, and Minerals Mission Area, Energy Resources Program, Groundwater and Streamflow Information Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Geology, Minerals, Energy, and Geophysics Science Center

Transient electromagnetic study of basin fill sediments in the Upper San Pedro Basin, Mexico Transient electromagnetic study of basin fill sediments in the Upper San Pedro Basin, Mexico

The Upper San Pedro River Basin in Mexico and the United States is an important riparian corridor that is coming under increasing pressure from growing populations and the associated increase in groundwater withdrawal. Several studies have produced three-dimensional maps of the basin fill sediments in the US portion of the basin but little work has been done in the Mexican portion of the...
Authors
M.W. Bultman, F. Gray

Coccidioides niches and habitat parameters in the southwestern United States: A matter of scale Coccidioides niches and habitat parameters in the southwestern United States: A matter of scale

To determine habitat attributes and processes suitable for the growth of Coccidioides, soils were collected from sites in Arizona, California, and Utah where Coccidioides is known to have been present. Humans or animals or both have been infected by Coccidioides at all of the sites. Soil variables considered in the upper 20 cm of the soil profile included pH, electrical conductivity...
Authors
F. S. Fisher, M.W. Bultman, S.M. Johnson, D. Pappagianis, E. Zaborsky

Candidate-penetrative-fracture mapping of the Grand Canyon area, Arizona, from spatial correlation of deep geophysical features and surficial lineaments Candidate-penetrative-fracture mapping of the Grand Canyon area, Arizona, from spatial correlation of deep geophysical features and surficial lineaments

Some aquifers of the southwestern Colorado Plateaus Province are deeply buried and overlain by several impermeable shale layers, and so recharge to the aquifer probably is mainly by seepage down penetrative-fracture systems. The purpose of this 2-year study, sponsored by the U.S. National Park Service, was to map candidate deep penetrative fractures over a 120,000-km2 area, using gravity...
Authors
Mark Gettings, Mark Bultman

A predictive penetrative fracture mapping method from regional potential field and geologic datasets, southwest Colorado Plateau, U.S.A. A predictive penetrative fracture mapping method from regional potential field and geologic datasets, southwest Colorado Plateau, U.S.A.

Some aquifers of the southwest Colorado Plateau, U.S.A., are deeply buried and overlain by several impermeable units, and thus recharge to the aquifer is probably mainly by seepage down penetrative fracture systems. This purpose of this study was to develop a method to map the location of candidate deep penetrative fractures over a 120,000 km2 area using gravity and aeromagnetic anomaly...
Authors
Mark Gettings, Mark Bultman
By
Geology, Minerals, Energy, and Geophysics Science Center

A Complex Systems Model Approach to Quantified Mineral Resource Appraisal A Complex Systems Model Approach to Quantified Mineral Resource Appraisal

For federal and state land management agencies, mineral resource appraisal has evolved from value-based to outcome-based procedures wherein the consequences of resource development are compared with those of other management options. Complex systems modeling is proposed as a general framework in which to build models that can evaluate outcomes. Three frequently used methods of mineral...
Authors
M. Gettings, M.W. Bultman, F. S. Fisher

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 Brady, Floyd Gray, Mario Castaneda, Mark Bultman, Karen Bolm
By
Geology, Energy, and Minerals Mission Area, Energy Resources Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Groundwater and Streamflow Information Program, Geology, Minerals, Energy, and Geophysics Science Center
USGS partners with Arizona to map critical mineral potential with cutting-edge data

USGS partners with Arizona to map critical mineral potential with cutting-edge data

RESTON, Va. — The U.S. Geological Survey (USGS) will invest more than $3.1 million to map critical mineral resources in Arizona in partnership with...

Read Article
Media Alert: USGS Announces Low-Level Airplane Flights to Image Geology in New Mexico

Media Alert: USGS Announces Low-Level Airplane Flights to Image Geology in New Mexico

Editor: In the public interest and in accordance with the Federal Aviation Administration regulations, the USGS is announcing this low-level airborne...

Read Article
Bipartisan Infrastructure Law helps map critical mineral resources in New Mexico

Bipartisan Infrastructure Law helps map critical mineral resources in New Mexico

RESTON, Va. — The U.S. Geological Survey will provide nearly $3.4 million to map critical-mineral resources in New Mexico in partnership with the New...

Read Article
Media Bulletin: Low-Flying Airplane and Helicopter Mapping Parts of West Texas and South-Central New Mexico to aid in Mapping Geology

Media Bulletin: Low-Flying Airplane and Helicopter Mapping Parts of West Texas and South-Central New Mexico to aid in Mapping Geology

Editor: In the public interest and in accordance with FAA regulations, the USGS is announcing this low-level airborne project. Your assistance in...

Read Article
Plumbing the Depths of the Great Basin

Plumbing the Depths of the Great Basin

Vast mineral wealth has been discovered in the Great Basin since the 1800s. As each new generation of prospectors and geologists brings their cutting...

Read Article

Science and Products

Image Collage of Landsat, pollinator, and volcanologist

Geophysical Imaging for Critical Mineral Resources in the Southern Basin and Range

Reliance on imports for many critical mineral commodities (including rare earth elements) puts the U.S. at high risk for supply disruption. Undiscovered deposits of some of these critical and strategic minerals undoubtedly exist in the United States, but a lack of modern geological, geophysical, and topographic data makes exploration challenging. This project plans to improve our knowledge of the...
By
Geology, Energy, and Minerals Mission Area, Mineral Resources Program, Geology, Minerals, Energy, and Geophysics Science Center
Geophysical Imaging for Critical Mineral Resources in the Southern Basin and Range

Geophysical Imaging for Critical Mineral Resources in the Southern Basin and Range

Reliance on imports for many critical mineral commodities (including rare earth elements) puts the U.S. at high risk for supply disruption. Undiscovered deposits of some of these critical and strategic minerals undoubtedly exist in the United States, but a lack of modern geological, geophysical, and topographic data makes exploration challenging. This project plans to improve our knowledge of the...
Learn More
USGS science for a changing world

Concealed Rare Earth Element (REE) Terranes in the Southern Basin and Range Geologic Province

We are working to develop an understanding of the types, sizes, and spatial distribution of rare-earth element (REE) related deposits in the Southern Basin and Range geologic province to help ensure the availability of REEs to industry in the United States. Geologic, geophysical, and geochemical data acquired will be used to develop permissive tracts for REE related deposits and to define areas of...
By
Mineral Resources Program, Geology, Minerals, Energy, and Geophysics Science Center
Concealed Rare Earth Element (REE) Terranes in the Southern Basin and Range Geologic Province

Concealed Rare Earth Element (REE) Terranes in the Southern Basin and Range Geologic Province

We are working to develop an understanding of the types, sizes, and spatial distribution of rare-earth element (REE) related deposits in the Southern Basin and Range geologic province to help ensure the availability of REEs to industry in the United States. Geologic, geophysical, and geochemical data acquired will be used to develop permissive tracts for REE related deposits and to define areas of...
Learn More
Image shows the Great Basin with a mountain in the background

Great Basin Metallogeny and Regional Structure - New Interpretations of Magnetic and Gravity Data

This project incorporates new geophysical technologies developed at the Tucson office of the Geology, Minerals, Energy, and Geophysics Science Center over the last 20 years for assessing mineral deposits concealed by basin sediments. These technologies include: textural classification of magnetic and magnetotelluric data and methods to characterize bedrock/basement lithologies, improved lineament...
By
Mineral Resources Program, Geology, Minerals, Energy, and Geophysics Science Center
Great Basin Metallogeny and Regional Structure - New Interpretations of Magnetic and Gravity Data

Great Basin Metallogeny and Regional Structure - New Interpretations of Magnetic and Gravity Data

This project incorporates new geophysical technologies developed at the Tucson office of the Geology, Minerals, Energy, and Geophysics Science Center over the last 20 years for assessing mineral deposits concealed by basin sediments. These technologies include: textural classification of magnetic and magnetotelluric data and methods to characterize bedrock/basement lithologies, improved lineament...
Learn More

Sopori Wash sub-basin gravity data, Pima and Santa Cruz Counties, Arizona Sopori Wash sub-basin gravity data, Pima and Santa Cruz Counties, Arizona

This data release contains new Earths gravity data from the Sopori Wash sub-basin in Pima and Santa Cruz Counties, Arizona. Data were acquired in January and March of 2017.
By
Geology, Minerals, Energy, and Geophysics Science Center

Database for the geologic map of the upper Santa Cruz River basin, southern Arizona Database for the geologic map of the upper Santa Cruz River basin, southern Arizona

This digital publication contains the database, base maps, and style files used to build the geologic map of the upper Santa Cruz River basin in southern Arizona published in U.S. Geological Survey Scientific Investigations Map 3490 (Page and others, 2023). Shapefiles are also included for the user’s convenience. In the database, there are polygon features outlining the map units and...
By
Geosciences and Environmental Change Science Center

Aeromagnetic and aeroradiometric data acquired over parts of the Trans-Pecos region of West Texas and Southern New Mexico Aeromagnetic and aeroradiometric data acquired over parts of the Trans-Pecos region of West Texas and Southern New Mexico

The Trans-Pecos region of West Texas and Southern New Mexico contains a series of rare earth element (REE) enriched ~ 34-36 Ma intrusive rhyolites and syenites. One such intrusive in the Sierra Blanca Mountains, Texas, hosts the Round Top REE deposit which is one of the few REE deposits in the U.S. with an economic evaluation and is scheduled to go into production in 2025. In addition...
By
Mineral Resources Program, Geology, Minerals, Energy, and Geophysics Science Center

GIS and Data Tables for Focus Areas for Potential Domestic Nonfuel Sources of Rare Earth Elements GIS and Data Tables for Focus Areas for Potential Domestic Nonfuel Sources of Rare Earth Elements

In response to Executive Order 13817 of December 20, 2017, the U.S. Geological Survey (USGS) coordinated with the Bureau of Land Management (BLM) to identify 35 nonfuel minerals or mineral materials considered critical to the economic and national security of the United States (U.S.). Acquiring information on possible domestic sources of these critical minerals is the basis of the USGS...
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center, Earth Mapping Resources Initiative (Earth MRI)

Geologic map and hydrogeologic investigations of the upper Santa Cruz River basin, southern Arizona Geologic map and hydrogeologic investigations of the upper Santa Cruz River basin, southern Arizona

This report includes an updated geologic map and cross sections of the upper Santa Cruz River basin, southern Arizona. The map and cross sections describe the geometry, thickness, and structure of the Miocene to Holocene units which form the main aquifers in the basin. The report also includes results of new hydrogeologic studies including (1) mapping and defining depth to bedrock based...
By
Geology, Minerals, Energy, and Geophysics Science Center, Geosciences and Environmental Change Science Center

Geologic map of the Rio Rico and Nogales 7.5’ quadrangles, Santa Cruz County, Arizona Geologic map of the Rio Rico and Nogales 7.5’ quadrangles, Santa Cruz County, Arizona

The Rio Rico and Nogales (Arizona) 1:24,000-scale quadrangles are located in the Basin and Range Province of southern Arizona, and the southern edge of the map is the international border with Sonora, Mexico. The major urban area is Nogales, a bi-national city known as “the gateway to Mexico.” Rocks exposed in the map area range in age from Jurassic through Quaternary. Major...
By
Groundwater and Streamflow Information Program, Geosciences and Environmental Change Science Center
Filter Total Items: 24

Geologic framework and hydrogeology of the Rio Rico and Nogales 7.5’ quadrangles, upper Santa Cruz Basin, Arizona, with three-dimensional hydrogeologic model Geologic framework and hydrogeology of the Rio Rico and Nogales 7.5’ quadrangles, upper Santa Cruz Basin, Arizona, with three-dimensional hydrogeologic model

Rapid population growth and declining annual recharge to aquifers in the upper Santa Cruz Basin area of southern Arizona, have increased the demand for additional groundwater resources. This demand is predicted to escalate in the future because of higher temperatures, longer droughts, less aquifer recharge, and decreased river and stream base flow. We conducted geologic studies to help...
Authors
William Page, Mark Bultman, D. Paco VanSistine, Christopher Menges, Floyd Gray, Michael Pantea
By
Groundwater and Streamflow Information Program, Geosciences and Environmental Change Science Center

Bedrock morphology and structure, upper Santa Cruz Basin, south-central Arizona, with transient electromagnetic survey data Bedrock morphology and structure, upper Santa Cruz Basin, south-central Arizona, with transient electromagnetic survey data

The upper Santa Cruz Basin is an important groundwater basin containing the regional aquifer for the city of Nogales, Arizona. This report provides data and interpretations of data aimed at better understanding the bedrock morphology and structure of the upper Santa Cruz Basin study area which encompasses the Rio Rico and Nogales 1:24,000-scale U.S. Geological Survey quadrangles. Data...
Authors
Mark Bultman, William Page
By
Geology, Energy, and Minerals Mission Area, Energy Resources Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Geology, Minerals, Energy, and Geophysics Science Center, Geosciences and Environmental Change Science Center

Hydrogeologic investigations of the Miocene Nogales Formation in the Nogales Area, Upper Santa Cruz Basin, Arizona Hydrogeologic investigations of the Miocene Nogales Formation in the Nogales Area, Upper Santa Cruz Basin, Arizona

Hydrogeologic investigations were conducted to evaluate the groundwater resource potential for the Miocene Nogales Formation in the Nogales area, southern Arizona. Results indicate that parts of the formation may provide new, deeper sources of groundwater for the area. Geologic mapping determined the hydrogeologic framework of the formation by defining lithologic, mineralogic, and...
Authors
William Page, Floyd Gray, Mark Bultman, Christopher Menges
By
Groundwater and Streamflow Information Program, Geosciences and Environmental Change Science Center

Detailed interpretation of aeromagnetic data from the Patagonia Mountains area, southeastern Arizona Detailed interpretation of aeromagnetic data from the Patagonia Mountains area, southeastern Arizona

The induced magnetic field and the remanent magnetic field of rock masses are important to geologic modeling based on Earth’s magnetic field data. The orientation of the induced magnetic field is approximately parallel to the orientation of Earth’s geomagnetic field and its intensity can be derived from measured magnetic susceptibilities of rocks in a study area. The orientation and...
Authors
Mark Bultman
By
Geology, Energy, and Minerals Mission Area, Energy Resources Program, Groundwater and Streamflow Information Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Geology, Minerals, Energy, and Geophysics Science Center

Magnetic susceptibility data for some exposed bedrock in the western conterminous United States Magnetic susceptibility data for some exposed bedrock in the western conterminous United States

In-place rock magnetic susceptibility measurements for 746 sites in the western conterminous United States are reported in a database. Of these 746 sites, 408 sites are in the Silverton Caldera area of the San Juan Mountains of southwestern Colorado. Of the 408 sites in the Silverton Caldera area, 106 sites are underground. The remaining 338 sites outside the Silverton Caldera area were...
Authors
Mark Gettings, Mark Bultman
By
Geology, Energy, and Minerals Mission Area, Energy Resources Program, Groundwater and Streamflow Information Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Geology, Minerals, Energy, and Geophysics Science Center

Investigation of the structure and lithology of bedrock concealed by basin fill, using ground-based magnetic-field-profile data acquired in the San Rafael Basin, southeastern Arizona Investigation of the structure and lithology of bedrock concealed by basin fill, using ground-based magnetic-field-profile data acquired in the San Rafael Basin, southeastern Arizona

Data on the Earth’s total-intensity magnetic field acquired near ground level and at measurement intervals as small as 1 m include information on the spatial distribution of nearsurface magnetic dipoles that in many cases are unique to a specific lithology. Such spatial information is expressed in the texture (physical appearance or characteristics) of the data at scales of hundreds of...
Authors
Mark Bultman
By
Geology, Energy, and Minerals Mission Area, Energy Resources Program, Groundwater and Streamflow Information Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Geology, Minerals, Energy, and Geophysics Science Center

Transient electromagnetic study of basin fill sediments in the Upper San Pedro Basin, Mexico Transient electromagnetic study of basin fill sediments in the Upper San Pedro Basin, Mexico

The Upper San Pedro River Basin in Mexico and the United States is an important riparian corridor that is coming under increasing pressure from growing populations and the associated increase in groundwater withdrawal. Several studies have produced three-dimensional maps of the basin fill sediments in the US portion of the basin but little work has been done in the Mexican portion of the...
Authors
M.W. Bultman, F. Gray

Coccidioides niches and habitat parameters in the southwestern United States: A matter of scale Coccidioides niches and habitat parameters in the southwestern United States: A matter of scale

To determine habitat attributes and processes suitable for the growth of Coccidioides, soils were collected from sites in Arizona, California, and Utah where Coccidioides is known to have been present. Humans or animals or both have been infected by Coccidioides at all of the sites. Soil variables considered in the upper 20 cm of the soil profile included pH, electrical conductivity...
Authors
F. S. Fisher, M.W. Bultman, S.M. Johnson, D. Pappagianis, E. Zaborsky

Candidate-penetrative-fracture mapping of the Grand Canyon area, Arizona, from spatial correlation of deep geophysical features and surficial lineaments Candidate-penetrative-fracture mapping of the Grand Canyon area, Arizona, from spatial correlation of deep geophysical features and surficial lineaments

Some aquifers of the southwestern Colorado Plateaus Province are deeply buried and overlain by several impermeable shale layers, and so recharge to the aquifer probably is mainly by seepage down penetrative-fracture systems. The purpose of this 2-year study, sponsored by the U.S. National Park Service, was to map candidate deep penetrative fractures over a 120,000-km2 area, using gravity...
Authors
Mark Gettings, Mark Bultman

A predictive penetrative fracture mapping method from regional potential field and geologic datasets, southwest Colorado Plateau, U.S.A. A predictive penetrative fracture mapping method from regional potential field and geologic datasets, southwest Colorado Plateau, U.S.A.

Some aquifers of the southwest Colorado Plateau, U.S.A., are deeply buried and overlain by several impermeable units, and thus recharge to the aquifer is probably mainly by seepage down penetrative fracture systems. This purpose of this study was to develop a method to map the location of candidate deep penetrative fractures over a 120,000 km2 area using gravity and aeromagnetic anomaly...
Authors
Mark Gettings, Mark Bultman
By
Geology, Minerals, Energy, and Geophysics Science Center

A Complex Systems Model Approach to Quantified Mineral Resource Appraisal A Complex Systems Model Approach to Quantified Mineral Resource Appraisal

For federal and state land management agencies, mineral resource appraisal has evolved from value-based to outcome-based procedures wherein the consequences of resource development are compared with those of other management options. Complex systems modeling is proposed as a general framework in which to build models that can evaluate outcomes. Three frequently used methods of mineral...
Authors
M. Gettings, M.W. Bultman, F. S. Fisher

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 Brady, Floyd Gray, Mario Castaneda, Mark Bultman, Karen Bolm
By
Geology, Energy, and Minerals Mission Area, Energy Resources Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Groundwater and Streamflow Information Program, Geology, Minerals, Energy, and Geophysics Science Center
USGS partners with Arizona to map critical mineral potential with cutting-edge data

USGS partners with Arizona to map critical mineral potential with cutting-edge data

RESTON, Va. — The U.S. Geological Survey (USGS) will invest more than $3.1 million to map critical mineral resources in Arizona in partnership with...

Read Article
Media Alert: USGS Announces Low-Level Airplane Flights to Image Geology in New Mexico

Media Alert: USGS Announces Low-Level Airplane Flights to Image Geology in New Mexico

Editor: In the public interest and in accordance with the Federal Aviation Administration regulations, the USGS is announcing this low-level airborne...

Read Article
Bipartisan Infrastructure Law helps map critical mineral resources in New Mexico

Bipartisan Infrastructure Law helps map critical mineral resources in New Mexico

RESTON, Va. — The U.S. Geological Survey will provide nearly $3.4 million to map critical-mineral resources in New Mexico in partnership with the New...

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Media Bulletin: Low-Flying Airplane and Helicopter Mapping Parts of West Texas and South-Central New Mexico to aid in Mapping Geology

Media Bulletin: Low-Flying Airplane and Helicopter Mapping Parts of West Texas and South-Central New Mexico to aid in Mapping Geology

Editor: In the public interest and in accordance with FAA regulations, the USGS is announcing this low-level airborne project. Your assistance in...

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Plumbing the Depths of the Great Basin

Plumbing the Depths of the Great Basin

Vast mineral wealth has been discovered in the Great Basin since the 1800s. As each new generation of prospectors and geologists brings their cutting...

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*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

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