Personal information

United States Geological Survey

Biography

I have been a Research Geologist with the USGS since 1992. I am currently a Project Chief managing bedrock geologic mapping activities in the northeastern United States. 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 automatically generated list of publications shown below is incomplete. Please contact me if you'd like a copy of my current CV.

Activities

Employment (1)

United States Geological Survey: Montpelier, VT, US

Research Geologist
Employment
Source: Self-asserted source
Gregory Walsh

Works (50 of 72)

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Page 1 of 2

Bedrock geologic map of the Woodstock quadrangle, Grafton County, New Hampshire

2024 | Report
Contributors: Gregory J. Walsh; William C. Burton; Thomas R. Armstrong; E. Allen Crider, Jr.
Source: check_circle
Crossref

Implementation plan of the National Cooperative Geologic Mapping Program strategy—Northeast region of the United States: New York and New England

2023 | Report
Contributors: Gregory J. Walsh; Margaret A. Thomas; Robert G. Marvinney; Stephen B. Mabee; Frederick H. Chormann; Andrew Kozlowski; Marjorie H. Gale; Jon Kim; Brian Savage
Source: check_circle
Crossref

Percent-slope map showing historical anthracite coal-mining infrastructure at the northern end of the Lackawanna syncline, Wayne, Susquehanna, and Lackawanna Counties, Pennsylvania

2023 | Report
Contributors: Gregory J. Walsh; Mark C. Walsh
Source: check_circle
Crossref

An apparent dip calculator for spreadsheets

2022 | Report
Contributors: Gregory J. Walsh
Source: check_circle
Crossref

Bedrock geologic map of the Crown Point quadrangle, Essex County, New York, and Addison County, Vermont

2022 | Report
Contributors: Gregory J. Walsh; Randall C. Orndorff; Ryan J. McAleer
Source: check_circle
Crossref

Integrated geophysical imaging of rare earth element-bearing iron oxide-apatite deposits in the Eastern Adirondack Highlands, New York

Geophysics
2021 | Journal article
Contributors: Shah, Anjana K.; Taylor, Ryan D.; Walsh, Gregory J.; Phillips, Jeffrey D.
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New interpretations of the ages and origins of the Hawkeye Granite Gneiss and Lyon Mountain Granite Gneiss, Adirondack Mountains, NY: Implications for the nature and timing of Mesoproterozoic plutonism, metamorphism, and deformation

Precambrian Research
2021 | Journal article
Contributors: Aleinikoff, John N.; Walsh, Gregory J.; McAleer, Ryan J.
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UNMIXING MULTIPLE METAMORPHIC MUSCOVITE AGE POPULATIONS WITH POWDER X-RAY DIFFRACTION AND 40Ar/ 39Ar ANALYSIS

American Journal of Science
2021 | Journal article
Contributors: McAleer, Ryan J.; Bish, David L.; Kunk, Michael J.; Valley, Peter M.; Walsh, Gregory J.; Wintsch, Robert P.
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Age and tectonic setting of the Quinebaug-Marlboro belt and implications for the history of Ganderian crustal fragments in southeastern New England, USA

Geosphere
2021-08-01 | Journal article
Contributors: Gregory J. Walsh; John N. Aleinikoff; Robert A. Ayuso; Robert P. Wintsch
Source: check_circle
Crossref
grade
Preferred source (of 2)‎

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

2020 | Report
Contributors: Gregory J. Walsh; Peter M. Valley; Peter J. Thompson; Nicholas M. Ratcliffe; Brooks P. Proctor; Karri R. Sicard
Source: check_circle
Crossref

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

2020 | Report
Contributors: Gregory J. Walsh; Peter M. Valley; Thomas R. Armstrong; Nicholas M. Ratcliffe; Arthur J. Merschat; Beau J. Gentry
Source: check_circle
Crossref

Geochronology of the Oliverian Plutonic Suite and the Ammonoosuc Volcanics in the Bronson Hill arc: Western New Hampshire, USA

Geosphere
2020 | Journal article
Contributors: Valley, Peter M.; Walsh, Gregory J.; Merschat, Arthur J.; McAleer, Ryan J.
Source: check_circle
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Photoluminescence Imaging of Whole Zircon Grains on a Petrographic Microscope-An Underused Aide for Geochronologic Studies

Minerals
2020 | Journal article
Contributors: McAleer, Ryan J.; Jubb, Aaron M.; Hackley, Paul C.; Walsh, Gregory J.; Merschat, Arthur J.; Regan, Sean P.; Burton, William C.; Vazquez, Jorge A.
Source: check_circle
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Geochemistry and Geophysics of Iron Oxide-Apatite Deposits and Associated Waste Piles with Implications for Potential Rare Earth Element Resources from Ore and Historical Mine Waste in the Eastern Adirondack Highlands, New York, USA

Economic Geology
2019 | Journal article
Contributors: Taylor, Ryan D.; Shah, Anjana K.; Walsh, Gregory J.; Taylor, Cliff D.
Source: check_circle
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Geophysical imaging of iron-oxide apatite deposits in the eastern Adirondacks, northern New York

LIFE WITH ORE DEPOSITS ON EARTH, PROCEEDINGS OF THE SGA BIENNIAL MEETING, VOLS 1-4
2019 | Journal article
Contributors: Shah, A. K.; Taylor, R. D.; Walsh, G. J.
Source: check_circle
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Syn-collisional exhumation of hot middle crust in the Adirondack Mountains (New York, USA): Implications for extensional orogenesis in the southern Grenville province

Geosphere
2019 | Journal article
Contributors: Regan, S. P.; Walsh, G. J.; Williams, M. L.; Chiarenzelli, J. R.; Taft, M.; McAleer, R.
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Apatite textures and REE chemistry in the iron oxide-apatite (IOA) deposits of the eastern Adirondack Highlands, New York, USA

MINERAL RESOURCES TO DISCOVER, VOLS 1-4
2017 | Journal article
Contributors: Taylor, Ryan D.; Taylor, Cliff D.; Walsh, Gregory J.; Shah, Anjana K.
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Reaction softening by dissolution-precipitation creep in a retrograde greenschist facies ductile shear zone, New Hampshire, USA

Journal of Metamorphic Geology
2017 | Journal article
Contributors: McAleer, R. J.; Bish, D. L.; Kunk, M. J.; Sicard, K. R.; Valley, P. M.; Walsh, G. J.; Wathen, B. A.; Wintsch, R. P.
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Bedrock geologic map of the Hartland and North Hartland quadrangles, Windsor County, Vermont, and Sullivan and Grafton Counties, New Hampshire

2016 | Report
Contributors: Gregory J. Walsh
Source: check_circle
Crossref

Identification of Groundwater Nitrate Contamination from Explosives Used in Road Construction: Isotopic, Chemical, and Hydrologic Evidence

Environmental Science & Technology
2016 | Journal article
Contributors: Degnan, James R.; Boehlke, J. K.; Pelham, Krystle; Langlais, David M.; Walsh, Gregory J.
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Bedrock geologic map of the Worcester South quadrangle, Worcester County, Massachusetts

2015 | Report
Contributors: Gregory J. Walsh; Arthur J. Merschat
Source: check_circle
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Bedrock geologic map of the Uxbridge quadrangle, Worcester County, Massachusetts, and Providence County, Rhode Island

2014 | Report
Contributors: Gregory J. Walsh
Source: check_circle
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Neoproterozoic-Cambrian stratigraphic framework of the Anti-Atlas and Ouzellagh promontory (High Atlas), Morocco

Journal of African Earth Sciences
2014 | Journal article
Contributors: Javier Alvaro, J.; Benziane, Fouad; Thomas, Robert; Walsh, Gregory J.; Yazidi, Abdelaziz
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Bedrock geologic map of the Nashua South quadrangle, Hillsborough County, New Hampshire, and Middlesex County, Massachusetts

2013 | Report
Contributors: Gregory J. Walsh; Richard H. Jahns; John N. Aleinikoff
Source: check_circle
Crossref

TELESCOPING METAMORPHIC ISOGRADS: EVIDENCE FROM 40Ar/39Ar DATING IN THE ORANGE-MILFORD BELT, SOUTHERN CONNECTICUT

American Journal of Science
2013 | Journal article
Contributors: Growdon, Martha L.; Kunk, Michael J.; Wintsch, Robert P.; Walsh, Gregory J.
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Neoproterozoic tectonic evolution of the Jebel Saghro and Bou Azzer-El Graara inliers, eastern and central Anti-Atlas, Morocco

Precambrian Research
2012 | Journal article
Contributors: Walsh, Gregory J.; Benziane, Fouad; Aleinikoff, John N.; Harrison, Richard W.; Yazidi, Abdelaziz; Burton, William C.; Quick, James E.; Saadane, Abderrahim
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Bedrock geologic map of the Grafton quadrangle, Worcester County, Massachusetts

2011 | Report
Contributors: Gregory J. Walsh; John N. Aleinikoff; Michael J. Dorais
Source: check_circle
Crossref

Bedrock geologic map of Vermont

2011 | Report
Contributors: Nicholas M. Ratcliffe; Rolfe S. Stanley; Marjorie H. Gale; Peter J. Thompson; Gregory J. Walsh; Norman L. With contributions by Hatch, Jr.; Douglas W. Rankin; Barry L. Doolan; Jonathan Kim; Charlotte J. Mehrtens et al.
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Cover sequences at the northern margin of the Antongil Craton, NE Madagascar

Precambrian Research
2011 | Journal article
Contributors: Bauer, Wilfried; Walsh, Gregory J.; de Waele, Bert; Thomas, Robert J.; Horstwood, Matthew S. A.; Bracciali, Laura; Schofield, David I.; Wollenberg, Uwe; Lidke, David J.; Rasaona, Imboarina T. et al.
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Polyphase Neoproterozoic orogenesis within the East Africa-Antarctica Orogenic Belt in central and northern Madagascar

Geological Society, London, Special Publications
2011 | Journal article
Contributors: Key, R. M.; Pitfield, P. E. J.; Thomas, R. J.; Goodenough, K. M.; De Waele, B.; Schofield, D. I.; Bauer, W.; Horstwood, M. S. A.; Styles, M. T.; Conrad, J. et al.
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Provisional zircon and monazite uranium-lead geochronology for selected rocks from Vermont

2011 | Report
Contributors: John N. Aleinikoff; Nicholas M. Ratcliffe; Gregory J. Walsh
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Bedrock geologic map of the Montpelier and Barre West quadrangles, Washington and Orange Counties, Vermont

2010 | Report
Contributors: Gregory J. Walsh; Jonathan Kim; Marjorie H. Gale; Sarah M. King
Source: check_circle
Crossref

Geological evolution of the Antongil Craton, NE Madagascar

Precambrian Research
2010 | Journal article
Contributors: Schofield, D. I.; Thomas, R. J.; Goodenough, K. M.; De Waele, B.; Pitfield, P. E. J.; Key, R. M.; Bauer, W.; Walsh, G. J.; Lidke, D. J.; Ralison, A. V. et al.
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SILURIAN-DEVONIAN AGE AND TECTONIC SETTING OF THE CONNECTICUT VALLEY-GASPE TROUGH IN VERMONT BASED ON U-Pb SHRIMP ANALYSES OF DETRITAL ZIRCONS

American Journal of Science
2010 | Journal article
Contributors: Mcwilliams, Cory K.; Walsh, Gregory J.; Wintsch, Robert P.
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A method for creating a three dimensional model from published geologic maps and cross sections

2009 | Report
Contributors: Gregory J. Walsh
Source: check_circle
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Bedrock geologic map of the Old Lyme quadrangle, New London and Middlesex Counties, Connecticut

2009 | Report
Contributors: Gregory J. Walsh; Robert B. Scott; John N. Aleinikoff; Thomas R. Armstrong
Source: check_circle
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Bedrock, Borehole, and Water-Quality Characterization of a Methane-Producing Water Well in Wolfeboro, New Hampshire

2008 | Report
Contributors: James R. Degnan; Gregory J. Walsh; Sarah M. Flanagan; Robert A. Burruss
Source: check_circle
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Borehole Characterization of a Methane-Yielding Bedrock Well, Tyngsborough, Massachusetts

2007 | Report
Contributors: Herbert A. Pierce; Gregory J. Walsh; Robert A. Burruss; James R. Degnan
Source: check_circle
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Integrated Multi-Scale Characterization of Ground-Water Flow and Chemical Transport in Fractured Crystalline Rock at the Mirror Lake Site, New Hampshire

Ocean Circulation: Mechanisms and Impacts-Past and Future Changes of Meridional Overturning
2007 | Journal article
Contributors: Shapiro, Allen M.; Hsieh, Paul A.; Burton, William C.; Walsh, Gregory J.
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Origin of the Lyme dome and implications for the timing of multiple Alleghanian deformational and intrusive events in southern Connecticut

American Journal of Science
2007 | Journal article
Contributors: Walsh, Gregory J.; Aleinikoff, John N.; Wintsch, Robert P.
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Shrimp U-Pb evidence for a late silurian age of metasedimentary rocks in the Merrimack and Putnam-Nashoba terranes, eastern New England

American Journal of Science
2007 | Journal article
Contributors: Wintsch, R. P.; Aleinikoff, J. N.; Walsh, G. J.; Bothner, W. A.; Hussey, A. M., II; Fanining, C. M.
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Preliminary Bedrock Geologic Map of the Old Lyme Quadrangle, New London and Middlesex Counties, Connecticut

2006 | Report
Contributors: Gregory J. Walsh; Robert B. Scott; John N. Aleinikoff; Thomas R. Armstrong
Source: check_circle
Crossref

Surface gamma-ray survey of the Barre West quadrangle, Washington and Orange Counties, Vermont

2005 | Report
Contributors: Gregory J. Walsh; Aaron M. Satkoski
Source: check_circle
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Bedrock geologic map of the New Milford quadrangle, Litchfield and Fairfield Counties, Connecticut

2004 | Report
Contributors: Gregory J. Walsh
Source: check_circle
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Bedrock geologic map of the New Milford quadrangle, Litchfield and Fairfield Counties, Connecticut

2004 | Report
Contributors: Gregory J. Walsh
Source: check_circle
Crossref

U-Pb geochronology and evolution of Mesoproterozoic basement rocks, western Connecticut

Memoir of the Geological Society of America
2004 | Journal article
Contributors: Walsh, Gregory J.; Aleinikoff, John N.; Fanning, C. Mark
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Bedrock geology in the vicinity of the Leicester Well site, Paxton, Massachusetts

2002 | Report
Contributors: Gregory J. Walsh
Source: check_circle
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Factors related to well yield in the fractured-bedrock aquifer of New Hampshire

2002 | Report
Contributors: Richard Bridge Moore; Gregory E. Schwartz; Stewart F. Clark; Gregory J. Walsh; James R. Degnan
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Crossref

U-Pb zircon geochronology of the Paleoproterozoic Tagragra de Tata inlier and its Neoproterozoic cover, western Anti-Atlas, Morocco

Precambrian Research
2002 | Journal article
Contributors: Walsh, GJ; Aleinikoff, JN; Benziane, F; Yazidi, A; Armstrong, TR
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Bedrock geology in the vicinity of the Knowles and Andreas well sites, West Newbury, Massachusetts

2001 | Report
Contributors: Gregory J. Walsh
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Peer review (5 reviews for 3 publications/grants)

Review activity for Arabian journal of geosciences. (1)
Review activity for Journal of African earth sciences. (3)
Review activity for Lithos. (1)