Gregory Walsh
I am a Project Leader and a Supervisory Research Geologist with the Florence Bascom Geoscience Center. I manage bedrock geologic mapping activities for the USGS in the northeastern United States. I managed two international mapping projects in Morocco, the completion of the new bedrock geologic map of Vermont, and I conducted mapping Madagascar.
I have expertise in geologic mapping, structural geology, geochronology, tectonics, digital cartography, and GIS. I specialize in the mapping, structure, and tectonics of complexly deformed rocks, the integration of geologic data with hydrogeologic and mineral resource assessment studies, and the use of GIS as a mapping and analysis tool. I have trained students and geologists in geologic mapping, GIS, GPS, digital mapping, and U-Pb geochronology by SHRIMP. The Publications listed on the tab below is automatically generated and incomplete. Please contact me if you would like a copy of my current CV.
Professional Experience
1992-Present, Research Geologist, U.S. Geological Survey, Reston, Virginia and Montpelier, Vermont
1990-1992, Consulting Geologist, Heindel and Noyes, Inc., Burlington, Vermont
1988-1990, Contractor, Vermont Agency of Natural Resources, Waterbury, Vermont
1986-1988, Teaching Assistant, University of Vermont, Department of Geology, Burlington, Vermont
1986, NAGT Intern Geologist, U.S. Geological Survey, Menlo Park, California
Education and Certifications
M.S. in Geology / University of Vermont, Burlington, Vermont USA, 1989
B.S. in Geology / University of Massachusetts, Amherst, Massachusetts, 1986
Affiliations and Memberships*
2013-Present, Fellow, Geological Society of America
1988-2013, Member, Geological Society of America
2013-2014, Elected Vice-Chair, Geological Society of America, Northeastern Section Management Board
2014-2015, Chair, Geological Society of America, Northeastern Section Management Board
2015-2016, Past-Chair, Geological Society of America, Northeastern Section Management Board
2012-Present, Member, Connecticut Geological Society
1998-Present, Member, New Hampshire Geological Society
1992-Present, Member, Vermont Geological Society
Honors and Awards
Dean’s List five semesters (1982-1986)
Amoco Geophysics Award (1985)
NAGT – USGS Student Internship (1985)
L.R. Wilson Award, UMASS Amherst (1986)
Charles G. Doll Award, Vermont Geological Society (1988)
Twenty-one USGS performance awards (1997-2021)
Elected GSA Fellow (2013)
Science and Products
Filter Total Items: 13
Filter Total Items: 77
Borehole Characterization of a Methane-Yielding Bedrock Well, Tyngsborough, Massachusetts
In August 2004, a domestic water well was drilled into granitoid metamorphic rocks 5.38 kilometers southwest of Tyngsborough, Massachusetts, on Scribner Hill. According to well driller Roger Skillings of Skillings and Sons, Inc. (oral commun., 2005), no water was encountered during drilling and when the borehole reached a depth of approximately 305.1 m, a blue flame exploded out of the well casing
Authors
Herbert A. Pierce, Gregory J. Walsh, Robert A. Burruss, James R. Degnan
Integrated multi‐scale characterization of ground‐water flow and chemical transport in fractured crystalline rock at the Mirror Lake Site, New Hampshire
This chapter contains sections titled:IntroductionMirror Lake SiteFractures and Geologic MappingHydraulic Properties of Fractured Rock From Meters to KilometersChemical Migration in Fractured RockFracture Controls on Ground‐Water Flow and Chemical Transport at the Mirror Lake SiteSummary
Authors
Allen M. Shapiro, Paul A. Hsieh, William C. Burton, Gregory J. Walsh
SHRIMP U-Pb evidence for a Late Silurian age of metasedimentary rocks in the Merrimack and Putnam-Nashoba terranes, eastern New England
U-Pb ages of detrital, metamorphic, and magmatic zircon and metamorphic monazite and titanite provide evidence for the ages of deposition and metamorphism of metasedimentary rocks from the Merrimack and Putnam-Nashoba terranes of eastern New England. Rocks from these terranes are interpreted here as having been deposited in the middle Paleozoic above Neoproterozoic basement of the Gander terrane a
Authors
R. P. Wintsch, J. N. Aleinikoff, G. J. Walsh, Wallace A. Bothner, A. M. Hussey, C.M. Fanning
Origin of the Lyme Dome and implications for the timing of multiple Alleghanian deformational and intrusive events in southern Connecticut
Geologic mapping, structural analysis, and geochronology in the area of the Lyme dome, southern Connecticut provides constraints on the origin of the rocks in the core of the dome, the absolute timing of the principal deformational and thermal events attributed to Alleghanian orogenesis, and the processes that generated the dome. Detrital zircon geochronology in combination with ages on intrusive
Authors
G. J. Walsh, J. N. Aleinikoff, R. P. Wintsch
Preliminary Bedrock Geologic Map of the Old Lyme Quadrangle, New London and Middlesex Counties, Connecticut
This report presents a preliminary map of the bedrock geology of the Old Lyme quadrangle, New London and Middlesex Counties, Connecticut. The map depicts contacts of bedrock geologic units, faults, outcrops, and structural geologic information. The map was published as part of a study of fractured bedrock aquifers and regional tectonics.
Authors
Gregory J. Walsh, Robert B. Scott, John N. Aleinikoff, Thomas R. Armstrong
Bedrock geology of the New Milford quadrangle, Connecticut
No abstract available.
Authors
Gregory J. Walsh
Surface gamma-ray survey of the Barre West quadrangle, Washington and Orange Counties, Vermont
This study was designed to determine the levels of naturally occurring radioactivity in bedrock from surface measurements at outcrops during the course of 1:24,000-scale geologic mapping and to determine which rock types were potential sources of radionuclides.
Elevated levels of total alpha particle radiation (gross alpha) occur in a public water system in Montpelier, Vermont. Measured gross a
Authors
Gregory J. Walsh, Aaron M. Satkoski
Bedrock geologic map of the New Milford quadrangle, Litchfield and Fairfield Counties, Connecticut
The bedrock geology of the New Milford quadrangle, Litchfield and Fairfield Counties, Connecticut is described in this report. The database includes contacts of bedrock geologic units, faults, outcrops, structural geologic information, and photos.
Authors
Gregory J. Walsh
Bedrock geologic map of the New Milford quadrangle, Litchfield and Fairfield Counties, Connecticut
The bedrock geology of the New Milford quadrangle, Litchfield and Fairfield Counties, Connecticut is described in this report. The database includes contacts of bedrock geologic units, faults, outcrops, structural geologic information, and photos.
Authors
Gregory J. Walsh
U-Pb geochronology and evolution of Mesoproterozoic basement rocks, western Connecticut
Geologic mapping and U-Pb geochronology by ion microprobe on zircon, titanite, and monazite in the New Milford quadrangle, western Connecticut indicate Meso-proterozoic events at ca. 1.3, 1.05, and 0.99 Ga in the Laurentian basement rocks. Pink granite gneiss (1311 ± 7 Ma) intruded a paragneiss sequence during the early stages of the Elzevirian orogeny. During the Ottawan orogeny, syn-tectonic ana
Authors
Gregory J. Walsh, John N. Aleinikoff, C. Mark Fanning
Factors related to well yield in the fractured-bedrock aquifer of New Hampshire
The New Hampshire Bedrock Aquifer Assessment was designed to provide information that can be used by communities, industry, professional consultants, and other interests to evaluate the ground-water development potential of the fractured-bedrock aquifer in the State. The assessment was done at statewide, regional, and well field scales to identify relations that potentially could increase the succ
Authors
Richard Bridge Moore, Gregory E. Schwartz, Stewart F. Clark, Gregory J. Walsh, James R. Degnan
Bedrock geology in the vicinity of the Leicester Well site, Paxton, Massachusetts
No abstract available.
Authors
Gregory J. Walsh
Science and Products
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- Publications
Filter Total Items: 77
Borehole Characterization of a Methane-Yielding Bedrock Well, Tyngsborough, Massachusetts
In August 2004, a domestic water well was drilled into granitoid metamorphic rocks 5.38 kilometers southwest of Tyngsborough, Massachusetts, on Scribner Hill. According to well driller Roger Skillings of Skillings and Sons, Inc. (oral commun., 2005), no water was encountered during drilling and when the borehole reached a depth of approximately 305.1 m, a blue flame exploded out of the well casingAuthorsHerbert A. Pierce, Gregory J. Walsh, Robert A. Burruss, James R. DegnanIntegrated multi‐scale characterization of ground‐water flow and chemical transport in fractured crystalline rock at the Mirror Lake Site, New Hampshire
This chapter contains sections titled:IntroductionMirror Lake SiteFractures and Geologic MappingHydraulic Properties of Fractured Rock From Meters to KilometersChemical Migration in Fractured RockFracture Controls on Ground‐Water Flow and Chemical Transport at the Mirror Lake SiteSummaryAuthorsAllen M. Shapiro, Paul A. Hsieh, William C. Burton, Gregory J. WalshSHRIMP U-Pb evidence for a Late Silurian age of metasedimentary rocks in the Merrimack and Putnam-Nashoba terranes, eastern New England
U-Pb ages of detrital, metamorphic, and magmatic zircon and metamorphic monazite and titanite provide evidence for the ages of deposition and metamorphism of metasedimentary rocks from the Merrimack and Putnam-Nashoba terranes of eastern New England. Rocks from these terranes are interpreted here as having been deposited in the middle Paleozoic above Neoproterozoic basement of the Gander terrane aAuthorsR. P. Wintsch, J. N. Aleinikoff, G. J. Walsh, Wallace A. Bothner, A. M. Hussey, C.M. FanningOrigin of the Lyme Dome and implications for the timing of multiple Alleghanian deformational and intrusive events in southern Connecticut
Geologic mapping, structural analysis, and geochronology in the area of the Lyme dome, southern Connecticut provides constraints on the origin of the rocks in the core of the dome, the absolute timing of the principal deformational and thermal events attributed to Alleghanian orogenesis, and the processes that generated the dome. Detrital zircon geochronology in combination with ages on intrusiveAuthorsG. J. Walsh, J. N. Aleinikoff, R. P. WintschPreliminary Bedrock Geologic Map of the Old Lyme Quadrangle, New London and Middlesex Counties, Connecticut
This report presents a preliminary map of the bedrock geology of the Old Lyme quadrangle, New London and Middlesex Counties, Connecticut. The map depicts contacts of bedrock geologic units, faults, outcrops, and structural geologic information. The map was published as part of a study of fractured bedrock aquifers and regional tectonics.AuthorsGregory J. Walsh, Robert B. Scott, John N. Aleinikoff, Thomas R. ArmstrongBedrock geology of the New Milford quadrangle, Connecticut
No abstract available.AuthorsGregory J. WalshSurface gamma-ray survey of the Barre West quadrangle, Washington and Orange Counties, Vermont
This study was designed to determine the levels of naturally occurring radioactivity in bedrock from surface measurements at outcrops during the course of 1:24,000-scale geologic mapping and to determine which rock types were potential sources of radionuclides. Elevated levels of total alpha particle radiation (gross alpha) occur in a public water system in Montpelier, Vermont. Measured gross aAuthorsGregory J. Walsh, Aaron M. SatkoskiBedrock geologic map of the New Milford quadrangle, Litchfield and Fairfield Counties, Connecticut
The bedrock geology of the New Milford quadrangle, Litchfield and Fairfield Counties, Connecticut is described in this report. The database includes contacts of bedrock geologic units, faults, outcrops, structural geologic information, and photos.AuthorsGregory J. WalshBedrock geologic map of the New Milford quadrangle, Litchfield and Fairfield Counties, Connecticut
The bedrock geology of the New Milford quadrangle, Litchfield and Fairfield Counties, Connecticut is described in this report. The database includes contacts of bedrock geologic units, faults, outcrops, structural geologic information, and photos.AuthorsGregory J. WalshU-Pb geochronology and evolution of Mesoproterozoic basement rocks, western Connecticut
Geologic mapping and U-Pb geochronology by ion microprobe on zircon, titanite, and monazite in the New Milford quadrangle, western Connecticut indicate Meso-proterozoic events at ca. 1.3, 1.05, and 0.99 Ga in the Laurentian basement rocks. Pink granite gneiss (1311 ± 7 Ma) intruded a paragneiss sequence during the early stages of the Elzevirian orogeny. During the Ottawan orogeny, syn-tectonic anaAuthorsGregory J. Walsh, John N. Aleinikoff, C. Mark FanningFactors related to well yield in the fractured-bedrock aquifer of New Hampshire
The New Hampshire Bedrock Aquifer Assessment was designed to provide information that can be used by communities, industry, professional consultants, and other interests to evaluate the ground-water development potential of the fractured-bedrock aquifer in the State. The assessment was done at statewide, regional, and well field scales to identify relations that potentially could increase the succAuthorsRichard Bridge Moore, Gregory E. Schwartz, Stewart F. Clark, Gregory J. Walsh, James R. DegnanBedrock geology in the vicinity of the Leicester Well site, Paxton, Massachusetts
No abstract available.AuthorsGregory J. Walsh
*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