Florence Bascom Geoscience Center

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The Florence Bascom Geoscience Center (FBGC) is at the leading edge of scientific research addressing critical societal issues and providing unbiased data and information to decision makers and the public. Our research center is built around five broad science themes: Paleoclimate & Paleoecology, Landscape Science, Geologic Mapping, Hazards, and Special Geologic Studies. 

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Job Vacancy Announcement

Job Vacancy Announcement

The Florence Bascom Geoscience Center is looking to hire a GS-06 Physical Science Technician to support the Appalachian Basin Geologic Mapping Project.

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Special Geoscience Studies Project

Special Geoscience Studies Project

The U.S. Department of State opened its National Museum of American Diplomacy and unveiled its first exhibits telling the story of American diplomacy. FBGC Scientist and Associate Director, Peter Chirico, is highlighted in the exhibit.

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Biography of Florence Bascom

Biography of Florence Bascom

The video in the link below is a brief but informative introduction to the life and work of Florence Bascom.

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News

Date published: March 6, 2020

Florence Bascom Geoscience Center Seminar Series - March 11, 2020

Please join us for a guest presentation by William Burton and Graham Lederer on Wednesday, March 11. They will be discussing some of John Wesley Powell's major accomplishments and present highlights from the fourth leg of the expedition. 

Date published: September 30, 2019

Florence Bascom Geoscience Center Seminar Series - October 3, 2019

Please join us for a guest presentation by Dr. Amy Myrbo on Thursday, October 3rd. She will be discussing the dangers of sulfate to wild rice and freshwater ecosystems. 

Date published: September 10, 2019

Florence Bascom Geoscience Center Seminar Series - September 10, 2019

Please join us on September 10th as Randall Orndorff discusses the North American Stratigraphic Code.

Publications

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Year Published: 2020

Sediment dynamics and implications for management: State of the science from long‐term research in the Chesapeake Bay watershed, USA

This review aims to synthesize the current knowledge of sediment dynamics using insights from long‐term research conducted in the watershed draining to the Chesapeake Bay, the largest estuary in the U.S., to inform management actions to restore the estuary and its watershed. The sediment dynamics of the Chesapeake are typical of many impaired...

Noe, Gregory B.; Cashman, Matthew J.; Skalak, Katherine; Gellis, Allen; Hopkins, Kristina G.; Moyer, Douglas; Webber, James; Benthem, Adam; Maloney, Kelly O.; Brakebill, John; Sekellick, Andrew; Langland, Michael J.; Zhang, Qian; Shenk, Gary Wynee; Keisman, Jennifer L.D.; Hupp, Cliff R.
Attribution: Northern Prairie Wildlife Research Center, Ecosystems, Region 1: North Atlantic-Appalachian, California Water Science Center, Water Resources, Geology, Geophysics, and Geochemistry Science Center, Region 7: Upper Colorado Basin, South Atlantic Water Science Center (SAWSC), Water Resources, Region 2: South Atlantic-Gulf (Includes Puerto Rico and the U.S. Virgin Islands), Earthquake Science Center, Natural Hazards, Earthquake Hazards Program, Patuxent Wildlife Research Center, Ecosystems, Region 1: North Atlantic-Appalachian, Western Fisheries Research Center, Ecosystems, Fisheries Program, Caribbean-Florida Water Science Center, Region 2: South Atlantic-Gulf (Includes Puerto Rico and the U.S. Virgin Islands), Northern Prairie Wildlife Research Center, Ecosystems, Central Energy Resources Science Center, Energy Resources Program, Region 7: Upper Colorado Basin, Patuxent Wildlife Research Center, Ecosystems, Region 1: North Atlantic-Appalachian, Fort Collins Science Center, Ecosystems, Fort Collins Science Center, Ecosystems, United States of America, Pacific Coastal and Marine Science Center, Pacific Coastal and Marine Science Center, National Wildlife Health Center, Ecosystems, Wetland and Aquatic Research Center, Ecosystems, Region 4: Mississippi Basin, Water Resources, Columbia Environmental Research Center, Ecosystems, Region 4: Mississippi Basin, Climate Adaptation Science Centers, Land Resources, Climate Adaptation Science Centers, California Water Science Center, Water Resources, Core Science Systems, National Geospatial Program, National Geospatial Technical Operations Center, Core Science Systems, National Geospatial Program, National Geospatial Technical Operations Center, Wetland and Aquatic Research Center, Ecosystems, Region 4: Mississippi Basin, Community for Data Integration (CDI), Science Analytics and Synthesis (SAS), United States of America, Utah Water Science Center, Water Resources, Region 7: Upper Colorado Basin, Wetland and Aquatic Research Center, Ecosystems, Region 4: Mississippi Basin, Alaska Science Center, Ecosystems, Region 11: Alaska, Southwest Biological Science Center, Ecosystems, Western Ecological Research Center, Ecosystems, Geosciences and Environmental Change Science Center, Region 7: Upper Colorado Basin, Washington Water Science Center, Water Resources, Wetland and Aquatic Research Center, Ecosystems, Region 4: Mississippi Basin, Central Energy Resources Science Center, Energy Resources Program, Region 7: Upper Colorado Basin, Southwest Biological Science Center, Ecosystems, Science and Decisions Center, Alaska Science Center, Ecosystems, Region 11: Alaska, Utah Water Science Center, Water Resources, Region 7: Upper Colorado Basin, Patuxent Wildlife Research Center, Ecosystems, Region 1: North Atlantic-Appalachian, Earth Resources Observation and Science (EROS) Center, Earth Resources Observation and Science Center, Water, New Jersey Water Science Center, Water Resources, Region 4: Mississippi Basin, New Jersey, United States of America, St. Petersburg Coastal and Marine Science Center, Region 2: South Atlantic-Gulf (Includes Puerto Rico and the U.S. Virgin Islands), Upper Midwest Water Science Center, Water Resources, Washington Water Science Center, Water Resources, Wetland and Aquatic Research Center, Ecosystems, Region 4: Mississippi Basin, Fort Collins Science Center, Ecosystems, Earthquake Science Center, Natural Hazards, Earthquake Hazards Program, Northern Prairie Wildlife Research Center, Ecosystems, Pacific Coastal and Marine Science Center, National Geospatial Program, Upper Midwest Water Science Center, Geology, Minerals, Energy, and Geophysics Science Center, Natural Hazards, Earthquake Hazards Program, Region 7: Upper Colorado Basin, Central Energy Resources Science Center, Energy Resources Program, Region 7: Upper Colorado Basin, Alaska Science Center, Ecosystems, Region 11: Alaska, Woods Hole Coastal and Marine Science Center, Region 1: North Atlantic-Appalachian, Wyoming-Montana Water Science Center, Water Resources, Florence Bascom Geoscience Center

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Year Published: 2020

Major-element compositional data and thermal data for drill core from Kīlauea Iki lava lake, plus analyses of glasses from scoria of the 1959 summit eruption of Kīlauea Volcano, Hawaii

This report presents electron microprobe data on glasses and selected crystalline phases from Kīlauea Iki lava lake and glasses from the 1959 summit eruption of Kīlauea Volcano, Hawaii. Some of these data have been published previously, but the complete set has not been published before. In addition, this report includes electron microprobe data...

Helz, Rosalind Tuthill
Attribution: Northern Prairie Wildlife Research Center, Ecosystems, Region 1: North Atlantic-Appalachian, California Water Science Center, Water Resources, Geology, Geophysics, and Geochemistry Science Center, Region 7: Upper Colorado Basin, South Atlantic Water Science Center (SAWSC), Water Resources, Region 2: South Atlantic-Gulf (Includes Puerto Rico and the U.S. Virgin Islands), Earthquake Science Center, Natural Hazards, Earthquake Hazards Program, Patuxent Wildlife Research Center, Ecosystems, Region 1: North Atlantic-Appalachian, Western Fisheries Research Center, Ecosystems, Fisheries Program, Caribbean-Florida Water Science Center, Region 2: South Atlantic-Gulf (Includes Puerto Rico and the U.S. Virgin Islands), Northern Prairie Wildlife Research Center, Ecosystems, Central Energy Resources Science Center, Energy Resources Program, Region 7: Upper Colorado Basin, Patuxent Wildlife Research Center, Ecosystems, Region 1: North Atlantic-Appalachian, Fort Collins Science Center, Ecosystems, Fort Collins Science Center, Ecosystems, United States of America, Pacific Coastal and Marine Science Center, Pacific Coastal and Marine Science Center, National Wildlife Health Center, Ecosystems, Wetland and Aquatic Research Center, Ecosystems, Region 4: Mississippi Basin, Water Resources, Columbia Environmental Research Center, Ecosystems, Region 4: Mississippi Basin, Climate Adaptation Science Centers, Land Resources, Climate Adaptation Science Centers, California Water Science Center, Water Resources, Core Science Systems, National Geospatial Program, National Geospatial Technical Operations Center, Core Science Systems, National Geospatial Program, National Geospatial Technical Operations Center, Wetland and Aquatic Research Center, Ecosystems, Region 4: Mississippi Basin, Community for Data Integration (CDI), Science Analytics and Synthesis (SAS), United States of America, Utah Water Science Center, Water Resources, Region 7: Upper Colorado Basin, Wetland and Aquatic Research Center, Ecosystems, Region 4: Mississippi Basin, Alaska Science Center, Ecosystems, Region 11: Alaska, Southwest Biological Science Center, Ecosystems, Western Ecological Research Center, Ecosystems, Geosciences and Environmental Change Science Center, Region 7: Upper Colorado Basin, Washington Water Science Center, Water Resources, Wetland and Aquatic Research Center, Ecosystems, Region 4: Mississippi Basin, Central Energy Resources Science Center, Energy Resources Program, Region 7: Upper Colorado Basin, Southwest Biological Science Center, Ecosystems, Science and Decisions Center, Alaska Science Center, Ecosystems, Region 11: Alaska, Utah Water Science Center, Water Resources, Region 7: Upper Colorado Basin, Patuxent Wildlife Research Center, Ecosystems, Region 1: North Atlantic-Appalachian, Earth Resources Observation and Science (EROS) Center, Earth Resources Observation and Science Center, Water, New Jersey Water Science Center, Water Resources, Region 4: Mississippi Basin, New Jersey, United States of America, St. Petersburg Coastal and Marine Science Center, Region 2: South Atlantic-Gulf (Includes Puerto Rico and the U.S. Virgin Islands), Upper Midwest Water Science Center, Water Resources, Washington Water Science Center, Water Resources, Wetland and Aquatic Research Center, Ecosystems, Region 4: Mississippi Basin, Fort Collins Science Center, Ecosystems, Earthquake Science Center, Natural Hazards, Earthquake Hazards Program, Northern Prairie Wildlife Research Center, Ecosystems, Pacific Coastal and Marine Science Center, National Geospatial Program, Upper Midwest Water Science Center, Geology, Minerals, Energy, and Geophysics Science Center, Natural Hazards, Earthquake Hazards Program, Region 7: Upper Colorado Basin, Central Energy Resources Science Center, Energy Resources Program, Region 7: Upper Colorado Basin, Alaska Science Center, Ecosystems, Region 11: Alaska, Woods Hole Coastal and Marine Science Center, Region 1: North Atlantic-Appalachian, Wyoming-Montana Water Science Center, Water Resources, Florence Bascom Geoscience Center, Western Fisheries Research Center, Ecosystems, Fisheries Program, Wetland and Aquatic Research Center, Ecosystems, Region 4: Mississippi Basin, Wetland and Aquatic Research Center, Ecosystems, Region 4: Mississippi Basin, New York, United States of America, Northern Prairie Wildlife Research Center, Ecosystems, Utah Water Science Center, Water Resources, Region 7: Upper Colorado Basin, Wetland and Aquatic Research Center, Ecosystems, Region 4: Mississippi Basin, Nebraska Water Science Center, Water Resources, New England Water Science Center, Water Resources, Region 4: Mississippi Basin, Dakota Water Science Center, Central Midwest Water Science Center, Eastern Mineral and Environmental Resources Science Center, Water Resources, Mineral Resources Program, Region 7: Upper Colorado Basin, United States of America, New England Water Science Center, Water Resources, Region 4: Mississippi Basin, Alaska Science Center, Ecosystems, Region 11: Alaska, Water, New Mexico Water Science Center, Water Resources, Region 7: Upper Colorado Basin, Utah, Switzerland, Colorado Water Science Center, Water Resources, Region 7: Upper Colorado Basin, Upper Midwest Environmental Sciences Center, Ecosystems, Upper Midwest Environmental Sciences Center, Ecosystems, Region 11: Alaska, California Water Science Center, Water Resources, New York Water Science Center, Water Resources, Geology, Geophysics, and Geochemistry Science Center, Water Resources, Region 7: Upper Colorado Basin, Alaska Science Center, Region 11: Alaska, Northern Rocky Mountain Science Center (NOROCK), Ecosystems, Western Fisheries Research Center, Ecosystems, Fisheries Program, Office of Science Quality and Integrity, Alaska Science Center, Region 11: Alaska, Northern Rocky Mountain Science Center (NOROCK), Ecosystems, Upper Midwest Water Science Center, Ecosystems, United States of America, Water, New Jersey Water Science Center, Water Resources, Region 1: North Atlantic-Appalachian, New Jersey, United States of America, Wetland and Aquatic Research Center, Ecosystems, Region 4: Mississippi Basin, Wetland and Aquatic Research Center, Ecosystems, Region 4: Mississippi Basin, United States of America, Water, Colorado Water Science Center, Water Resources, Region 7: Upper Colorado Basin, Colorado, United States of America, Ecosystems, Volcano Hazards Program Office, Region 11: Alaska, United States of America, Pacific Island Ecosystems Research Center, Ecosystems, Ecosystems, Volcano Hazards Program Office, Region 11: Alaska, United States of America, Western Fisheries Research Center, Ecosystems, Fisheries Program, Patuxent Wildlife Research Center, Ecosystems, Region 1: North Atlantic-Appalachian, Geology, Minerals, Energy, and Geophysics Science Center, Washington Water Science Center, Water Resources, Western Ecological Research Center, Ecosystems, National Wildlife Health Center, Ecosystems, Patuxent Wildlife Research Center, Ecosystems, Region 1: North Atlantic-Appalachian, Geology, Minerals, Energy, and Geophysics Science Center, Environmental Health, Kansas Water Science Center, Water Resources, Western Fisheries Research Center, Ecosystems, Fisheries Program, Eastern Energy Resources Science Center, Energy Resources Program, National Wildlife Health Center, Ecosystems, Water, New Mexico Water Science Center, Water Resources, Region 7: Upper Colorado Basin, New Mexico, United States of America, Northern Prairie Wildlife Research Center, Ecosystems, Lower Mississippi-Gulf Water Science Center, Region 4: Mississippi Basin, Lower Mississippi-Gulf Water Science Center, Region 4: Mississippi Basin, Lower Mississippi-Gulf Water Science Center, Region 4: Mississippi Basin, National Wildlife Health Center, Ecosystems, Pacific Coastal and Marine Science Center, Eastern Energy Resources Science Center, Energy Resources Program, United States of America, Western Fisheries Research Center, Ecosystems, Fisheries Program, Volcano Hazards Program Office, Alaska Science Center, Ecosystems, Region 11: Alaska, Geology, Geophysics, and Geochemistry Science Center, Region 7: Upper Colorado Basin, Upper Midwest Water Science Center, Water Resources, Geology, Woods Hole Coastal and Marine Science Center, Coastal and Marine Hazards and Resources Program, Region 1: North Atlantic-Appalachian, Washington, United States of America, Natural Hazards, Geologic Hazards Science Center, Natural Hazards, Landslide Hazards Program, Region 7: Upper Colorado Basin, Ecuador, Natural Hazards, Geologic Hazards Science Center, Natural Hazards, Landslide Hazards Program, Region 7: Upper Colorado Basin, United States of America, Water, New Jersey Water Science Center, Water Resources, Region 1: North Atlantic-Appalachian, New Jersey, United States of America, Forest and Rangeland Ecosystem Science Center (FRESC), Ecosystems, Pacific Coastal and Marine Science Center, New England Water Science Center, Water Resources, Region 4: Mississippi Basin, Ecosystems, Earthquake Science Center, Natural Hazards, Earthquake Hazards Program, Western Fisheries Research Center, Ecosystems, Fisheries Program, Alaska Science Center, Ecosystems, Region 11: Alaska, Central Midwest Water Science Center, Wetland and Aquatic Research Center, Ecosystems, Region 4: Mississippi Basin, Water Resources, Pacific Coastal and Marine Science Center, Water Resources, Western Ecological Research Center, Ecosystems, Western Ecological Research Center, Ecosystems, Earthquake Science Center, Natural Hazards, Earthquake Hazards Program, Northern Prairie Wildlife Research Center, Ecosystems, Woods Hole Coastal and Marine Science Center, Region 1: North Atlantic-Appalachian, New York Water Science Center, Water Resources, California Water Science Center, Water Resources, Utah Water Science Center, Water Resources, Region 7: Upper Colorado Basin, Patuxent Wildlife Research Center, Ecosystems, Region 1: North Atlantic-Appalachian, Western Ecological Research Center, Ecosystems, Volcano Hazards Program Office, Pacific Coastal and Marine Science Center, National Wildlife Health Center, Ecosystems, Lower Mississippi-Gulf Water Science Center, Region 4: Mississippi Basin, Pacific Islands Water Science Center, Water Resources, Wetland and Aquatic Research Center, Ecosystems, Region 4: Mississippi Basin, Natural Hazards, Volcano Hazards Program Office, Water Resources, Northern Rocky Mountain Science Center (NOROCK), Ecosystems, Upper Midwest Water Science Center, Fort Collins Science Center, Ecosystems, Wetland and Aquatic Research Center, Ecosystems, Region 4: Mississippi Basin, Leetown Science Center, Ecosystems, Region 1: North Atlantic-Appalachian, Forest and Rangeland Ecosystem Science Center (FRESC), Ecosystems, Natural Hazards, Pacific Coastal and Marine Science Center, Natural Hazards, Earthquake Hazards Program, Utah, United States of America, Alaska Science Center, Ecosystems, Region 11: Alaska, Water, Colorado Water Science Center, Water Resources, Region 7: Upper Colorado Basin, United States of America, Geology, Minerals, Energy, and Geophysics Science Center, Volcano Hazards Program Office, Alaska Science Center, Ecosystems, Region 11: Alaska, Water, Pennsylvania Water Science Center, Water Resources, Region 1: North Atlantic-Appalachian, Pennsylvania, United States of America, Geology, Geophysics, and Geochemistry Science Center, Region 7: Upper Colorado Basin, United States of America, Earth Mapping Resources Initiative (Earth MRI), Region 11: Alaska, Upper Midwest Water Science Center, Climate Adaptation Science Centers, Land Resources, Climate Adaptation Science Centers, Dakota Water Science Center, Southwest Climate Adaptation Science Center, Land Resources, Natural Hazards, Earthquake Science Center, Natural Hazards, Earthquake Hazards Program, Region 11: Alaska, Alaska, United States of America, Alaska Science Center, Ecosystems, Region 11: Alaska, Cooperative Research Units, Nebraska Water Science Center, Water Resources, Water, New Mexico Water Science Center, Water Resources, Region 7: Upper Colorado Basin, New Mexico, United States of America, Geologic Hazards Science Center, Natural Hazards, Region 11: Alaska, United States of America, Western Ecological Research Center, Ecosystems, Dakota Water Science Center, Ohio-Kentucky-Indiana Water Science Center, Upper Midwest Water Science Center, Central Midwest Water Science Center, Water, Pennsylvania Water Science Center, Water Resources, Region 7: Upper Colorado Basin, United States of America, Central Energy Resources Science Center, Energy Resources Program, Region 7: Upper Colorado Basin, Natural Hazards, Earthquake Science Center, Natural Hazards, Earthquake Hazards Program, California, United States of America, Eastern Energy Resources Science Center, Energy Resources Program, Lower Mississippi-Gulf Water Science Center, Region 4: Mississippi Basin, Great Lakes Science Center, Ecosystems, Fort Collins Science Center, Ecosystems, Alaska Science Center, Ecosystems, Region 11: Alaska, Patuxent Wildlife Research Center, Ecosystems, Region 1: North Atlantic-Appalachian, Ohio-Kentucky-Indiana Water Science Center, Upper Midwest Water Science Center, Great Lakes Science Center, Ecosystems, Volcano Hazards Program Office, Upper Midwest Water Science Center, Alaska Science Center, Ecosystems, Region 11: Alaska, National Wildlife Health Center, Ecosystems, Natural Hazards, Geologic Hazards Science Center, Natural Hazards, Landslide Hazards Program, Region 7: Upper Colorado Basin, United States of America, Alaska Science Center, Ecosystems, Region 11: Alaska, Washington Water Science Center, Water Resources, Columbia Environmental Research Center, Ecosystems, Region 4: Mississippi Basin, Fort Collins Science Center, Ecosystems, Water, Colorado Water Science Center, Water Resources, Region 7: Upper Colorado Basin, Colorado, United States of America, Geology, Geophysics, and Geochemistry Science Center, Region 7: Upper Colorado Basin, Southwest Biological Science Center, Ecosystems, Upper Midwest Water Science Center, Water Resources, Alaska Science Center, Ecosystems, Region 11: Alaska, Geology, Minerals, Energy, and Geophysics Science Center, St. Petersburg Coastal and Marine Science Center, Region 2: South Atlantic-Gulf (Includes Puerto Rico and the U.S. Virgin Islands), United States of America, Central Energy Resources Science Center, Energy Resources Program, Region 7: Upper Colorado Basin, Northern Rocky Mountain Science Center (NOROCK), Ecosystems, Wetland and Aquatic Research Center, Ecosystems, Region 4: Mississippi Basin, Geologic Hazards Science Center, Natural Hazards, Region 7: Upper Colorado Basin, Geology, Minerals, Energy, and Geophysics Science Center, Region 7: Upper Colorado Basin, United States of America, Geology, Minerals, Energy, and Geophysics Science Center, Region 7: Upper Colorado Basin, United States of America, California Water Science Center, Water Resources, United States of America, Volcano Hazards Program Office, United States of America, South Atlantic Water Science Center (SAWSC), Water Resources, Region 2: South Atlantic-Gulf (Includes Puerto Rico and the U.S. Virgin Islands), Texas Water Science Center, Water Resources, Region 6: Arkansas-Rio Grande-Texas-Gulf, United States of America, Pacific Island Ecosystems Research Center, Ecosystems, Central Midwest Water Science Center, Pacific Coastal and Marine Science Center, United States of America, Geosciences and Environmental Change Science Center, Region 7: Upper Colorado Basin, Forest and Rangeland Ecosystem Science Center (FRESC), Ecosystems, United States of America, Wetland and Aquatic Research Center, Ecosystems, Region 4: Mississippi Basin, Lower Mississippi-Gulf Water Science Center, Region 4: Mississippi Basin, United States of America, Ohio-Kentucky-Indiana Water Science Center, United States of America, Lower Mississippi-Gulf Water Science Center, Region 4: Mississippi Basin, United States of America, Water, Pennsylvania Water Science Center, Water Resources, Region 1: North Atlantic-Appalachian, Pennsylvania, United States of America, Southwest Biological Science Center, Ecosystems, Fort Collins Science Center, Ecosystems, Wetland and Aquatic Research Center, Ecosystems, Region 4: Mississippi Basin, United States of America, Wetland and Aquatic Research Center, Ecosystems, Region 4: Mississippi Basin, Volcano Hazards Program Office, Volcano Hazards Program Office, Eastern Energy Resources Science Center, Energy Resources Program, Pacific Coastal and Marine Science Center, Florence Bascom Geoscience Center
Helz, R.T., 2020, Major-element compositional data and thermal data for drill core from Kīlauea Iki lava lake, plus analyses of glasses from scoria of the 1959 summit eruption of Kīlauea Volcano, Hawaii: U.S. Geological Survey Open-File Report 2020–1012, 48 p., https://doi.org/10.3133/ofr20201012.

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Year Published: 2020

Bedrock geologic map of the Mount Ascutney 7.5- x 15-minute quadrangle, Windsor County, Vermont, and Sullivan County, New Hampshire

The bedrock geology of the Mount Ascutney 7.5- x 15-minute quadrangle consists of highly deformed and metamorphosed Mesoproterozoic through Devonian metasedimentary and meta-igneous rocks intruded by rocks of the Mesozoic White Mountain Igneous Suite. In the west, Mesoproterozoic gneisses of the Mount Holly Complex are the oldest rocks and form...

Walsh, Gregory J.; Valley, Peter M.; Thompson, Peter J.; Ratcliffe, Nicholas M.; Proctor, Brooks P.; Sicard, Karri R.
Walsh, G.J., Valley, P.M., Thompson, P.J., Ratcliffe, N.M., Proctor, B.P., and Sicard, K.R., 2020, Bedrock geologic map of the Mount Ascutney 7.5- x 15-minute quadrangle, Windsor County, Vermont, and Sullivan County, New Hampshire (ver. 1.1, April 2020): U.S. Geological Survey Scientific Investigations Map 3440, 2 sheets, scale 1:24,000, https://doi.org/10.3133/sim3440.