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Zachary Engle (Former Employee)

Science and Products

Decorative banner image of Color cathodoluminescence (CL) image of zircons

USGS Geochron: A database of USGS geochronological and thermochronological data

The U.S. Geological Survey (USGS) has developed an updated geochronology database (USGS Geochron) to include geochronology summary and analytical data created or funded by the USGS.
By
Geosciences and Environmental Change Science Center
USGS Geochron: A database of USGS geochronological and thermochronological data

USGS Geochron: A database of USGS geochronological and thermochronological data

The U.S. Geological Survey (USGS) has developed an updated geochronology database (USGS Geochron) to include geochronology summary and analytical data created or funded by the USGS.
Learn More
Mt. Ouray, Colorado with aspen colors

Geologic Framework of the Intermountain West

The Geologic Framework of the Intermountain West (IMW) Project conducts 1:24,000- to 1:100,000-scale geologic mapping to support framework geologic investigations. The IMW project is prioritizing development of a seamless, integrated geologic map database in targeted areas of the Intermountain West region of the United States that host substantial mineral, energy, water, and industrial material...
By
Geosciences and Environmental Change Science Center
Geologic Framework of the Intermountain West

Geologic Framework of the Intermountain West

The Geologic Framework of the Intermountain West (IMW) Project conducts 1:24,000- to 1:100,000-scale geologic mapping to support framework geologic investigations. The IMW project is prioritizing development of a seamless, integrated geologic map database in targeted areas of the Intermountain West region of the United States that host substantial mineral, energy, water, and industrial material...
Learn More

USGS Geochron: A Database of Geochronological and Thermochronological Dates and Data (ver. 4.0, May 2025) USGS Geochron: A Database of Geochronological and Thermochronological Dates and Data (ver. 4.0, May 2025)

USGS Geochron is a database of geochronological and thermochronological dates and data. The data set contains published ages, dates, analytical information, sample metadata including location, and source citations. The following analytical techniques are represented in the data set: 40Ar/39Ar, K-Ar, U-Th-Pb, Sm-Nd, Rb-Sr, Lu-Hf, fission track, luminescence, U-series, (U-Th)/He, Re-Os...
By
Community for Data Integration (CDI), Geosciences and Environmental Change Science Center

Raster and mapping data indicating landscape change from the June 2012 storm in the Duluth, MN region Raster and mapping data indicating landscape change from the June 2012 storm in the Duluth, MN region

The GeoTiff raster data were created from subtraction of elevation values collected in 2012 from elevation values collected in 2011. Both data collections were conducted by airborne lidar surveys contracted by the Minnesota Department of Natural Resources. These survey occured before and after a historical rain event that cause widespread landscape change. The shapefiles are polygon...
By
Earthquake Hazards Program, Earthquake Science Center

Enhancing mineral systems exploration through geochronology, thermochronology, and isotope analysis: USGS Geochron and USGS Isotope databases Enhancing mineral systems exploration through geochronology, thermochronology, and isotope analysis: USGS Geochron and USGS Isotope databases

A mineral systems approach to mineral exploration provides a comprehensive framework for understanding ore deposit formation by examining the geodynamic, magmatic, hydrothermal, and sedimentary processes responsible for mineralization, alteration, and remobilization of economic mineral deposits. Temporal and thermal constraints on ore genesis are crucial for refining mineral system...
Authors
Kelly David Thomson, Ian William Hillenbrand, Amy K. Gilmer, Leah E. Morgan, Zachary T. Engle, Anna T. Miller
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center, Geosciences and Environmental Change Science Center

Factors influencing landslide occurrence in low-relief formerly glaciated landscapes: Landslide inventory and susceptibility analysis in Minnesota, USA Factors influencing landslide occurrence in low-relief formerly glaciated landscapes: Landslide inventory and susceptibility analysis in Minnesota, USA

In landscapes recently impacted by continental glaciation, landslides may occur where topographic relief has been generated by the drainage of glacial lakes and ensuing post-glacial fluvial network development into unconsolidated glacially derived sediments and exhumed bedrock. To investigate linkages among environmental variables, post-glacial landscape development, and landslides, we...
Authors
Laura Triplett, Morena N Hammer, Stephen B. DeLong, Karen B. Gran, Carrie E. Jennings, Zachary T. Engle, Julie K. Bartley, Dylan J. Blumentritt, Andy Breckenridge, Stephanie Day, Melissa A. Kohout, Philip H. Larson, Jeni A. McDermott, Emilie Richard
By
Natural Hazards Mission Area, Earthquake Hazards Program, Earthquake Science Center

Regional-scale mapping of landscape response to extreme precipitation using repeat lidar and object-based image analysis Regional-scale mapping of landscape response to extreme precipitation using repeat lidar and object-based image analysis

Extreme precipitation events may cause flooding, slope failure, erosion, deposition, and damage to infrastructure over a regional scale, but the impacts of these events are often difficult to fully characterize. Regional-scale landscape change occurred during an extreme rain event in June 2012 in northeastern Minnesota. Landscape change was documented by 8,000 km2 of airborne lidar data...
Authors
Stephen B. DeLong, Morena N Hammer, Zachary T. Engle, Emilie Richard, Andrew Breckenridge, Karen B. Gran, Carrie E. Jennings, Andre Jalobeanu
By
Natural Hazards Mission Area, Earthquake Hazards Program, Earthquake Science Center

USGS Geochron Database Explorer USGS Geochron Database Explorer

This Web Application is a tool for viewing, exploring, and downloading the "USGS Geochron: A Database of Geochronological and Thermochronological Dates and Data" Data Release.
By
Geosciences and Environmental Change Science Center

Science and Products

Decorative banner image of Color cathodoluminescence (CL) image of zircons

USGS Geochron: A database of USGS geochronological and thermochronological data

The U.S. Geological Survey (USGS) has developed an updated geochronology database (USGS Geochron) to include geochronology summary and analytical data created or funded by the USGS.
By
Geosciences and Environmental Change Science Center
USGS Geochron: A database of USGS geochronological and thermochronological data

USGS Geochron: A database of USGS geochronological and thermochronological data

The U.S. Geological Survey (USGS) has developed an updated geochronology database (USGS Geochron) to include geochronology summary and analytical data created or funded by the USGS.
Learn More
Mt. Ouray, Colorado with aspen colors

Geologic Framework of the Intermountain West

The Geologic Framework of the Intermountain West (IMW) Project conducts 1:24,000- to 1:100,000-scale geologic mapping to support framework geologic investigations. The IMW project is prioritizing development of a seamless, integrated geologic map database in targeted areas of the Intermountain West region of the United States that host substantial mineral, energy, water, and industrial material...
By
Geosciences and Environmental Change Science Center
Geologic Framework of the Intermountain West

Geologic Framework of the Intermountain West

The Geologic Framework of the Intermountain West (IMW) Project conducts 1:24,000- to 1:100,000-scale geologic mapping to support framework geologic investigations. The IMW project is prioritizing development of a seamless, integrated geologic map database in targeted areas of the Intermountain West region of the United States that host substantial mineral, energy, water, and industrial material...
Learn More

USGS Geochron: A Database of Geochronological and Thermochronological Dates and Data (ver. 4.0, May 2025) USGS Geochron: A Database of Geochronological and Thermochronological Dates and Data (ver. 4.0, May 2025)

USGS Geochron is a database of geochronological and thermochronological dates and data. The data set contains published ages, dates, analytical information, sample metadata including location, and source citations. The following analytical techniques are represented in the data set: 40Ar/39Ar, K-Ar, U-Th-Pb, Sm-Nd, Rb-Sr, Lu-Hf, fission track, luminescence, U-series, (U-Th)/He, Re-Os...
By
Community for Data Integration (CDI), Geosciences and Environmental Change Science Center

Raster and mapping data indicating landscape change from the June 2012 storm in the Duluth, MN region Raster and mapping data indicating landscape change from the June 2012 storm in the Duluth, MN region

The GeoTiff raster data were created from subtraction of elevation values collected in 2012 from elevation values collected in 2011. Both data collections were conducted by airborne lidar surveys contracted by the Minnesota Department of Natural Resources. These survey occured before and after a historical rain event that cause widespread landscape change. The shapefiles are polygon...
By
Earthquake Hazards Program, Earthquake Science Center

Enhancing mineral systems exploration through geochronology, thermochronology, and isotope analysis: USGS Geochron and USGS Isotope databases Enhancing mineral systems exploration through geochronology, thermochronology, and isotope analysis: USGS Geochron and USGS Isotope databases

A mineral systems approach to mineral exploration provides a comprehensive framework for understanding ore deposit formation by examining the geodynamic, magmatic, hydrothermal, and sedimentary processes responsible for mineralization, alteration, and remobilization of economic mineral deposits. Temporal and thermal constraints on ore genesis are crucial for refining mineral system...
Authors
Kelly David Thomson, Ian William Hillenbrand, Amy K. Gilmer, Leah E. Morgan, Zachary T. Engle, Anna T. Miller
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center, Geosciences and Environmental Change Science Center

Factors influencing landslide occurrence in low-relief formerly glaciated landscapes: Landslide inventory and susceptibility analysis in Minnesota, USA Factors influencing landslide occurrence in low-relief formerly glaciated landscapes: Landslide inventory and susceptibility analysis in Minnesota, USA

In landscapes recently impacted by continental glaciation, landslides may occur where topographic relief has been generated by the drainage of glacial lakes and ensuing post-glacial fluvial network development into unconsolidated glacially derived sediments and exhumed bedrock. To investigate linkages among environmental variables, post-glacial landscape development, and landslides, we...
Authors
Laura Triplett, Morena N Hammer, Stephen B. DeLong, Karen B. Gran, Carrie E. Jennings, Zachary T. Engle, Julie K. Bartley, Dylan J. Blumentritt, Andy Breckenridge, Stephanie Day, Melissa A. Kohout, Philip H. Larson, Jeni A. McDermott, Emilie Richard
By
Natural Hazards Mission Area, Earthquake Hazards Program, Earthquake Science Center

Regional-scale mapping of landscape response to extreme precipitation using repeat lidar and object-based image analysis Regional-scale mapping of landscape response to extreme precipitation using repeat lidar and object-based image analysis

Extreme precipitation events may cause flooding, slope failure, erosion, deposition, and damage to infrastructure over a regional scale, but the impacts of these events are often difficult to fully characterize. Regional-scale landscape change occurred during an extreme rain event in June 2012 in northeastern Minnesota. Landscape change was documented by 8,000 km2 of airborne lidar data...
Authors
Stephen B. DeLong, Morena N Hammer, Zachary T. Engle, Emilie Richard, Andrew Breckenridge, Karen B. Gran, Carrie E. Jennings, Andre Jalobeanu
By
Natural Hazards Mission Area, Earthquake Hazards Program, Earthquake Science Center

USGS Geochron Database Explorer USGS Geochron Database Explorer

This Web Application is a tool for viewing, exploring, and downloading the "USGS Geochron: A Database of Geochronological and Thermochronological Dates and Data" Data Release.
By
Geosciences and Environmental Change Science Center
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