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
U-Pb zircon geochronology of the Paleoproterozoic Tagragra de Tata inlier and its Neoproterozoic cover, western Anti-Atlas, Morocco
Bedrock geology in the vicinity of the Knowles and Andreas well sites, West Newbury, Massachusetts
Bedrock geology in the vicinity of the Rockland Avenue well site, Maynard, Massachusetts
Bedrock geologic map of the Hubbard Brook experimental forest, Grafton County, New Hampshire
Contrasting methods of fracture trend characterization in crystalline metamorphic and igneous rocks of the Windham quadrangle, New Hampshire
Bedrock geologic map of the Hubbard Brook experimental forest, Grafton County, New Hampshire
Tectonic and regional metamorphic implications of the discovery of Middle Ordovician conodonts in cover rocks east of the Green Mountain massif, Vermont
U-Pb zircon age of metafelsite from the Pinney Hollow formation: Implications for the development of the Vermont Appalachians
Bedrock geologic map of the Windham quadrangle, Rockingham and Hillsborough counties, New Hampshire
Digital bedrock geologic map of the Mount Carmel 7.5 x 15 minute quadrangle, Vermont
Digital bedrock geologic map of the Vermont part of the Hartland quadrangle, Windsor County, Vermont
Digital and preliminary bedrock geologic map of the Mount Carmel quadrangle, Vermont
Science and Products
- Science
- Data
- Maps
Filter Total Items: 13
- Multimedia
- Publications
Filter Total Items: 77
U-Pb zircon geochronology of the Paleoproterozoic Tagragra de Tata inlier and its Neoproterozoic cover, western Anti-Atlas, Morocco
New U-Pb zircon data obtained by sensitive high resolution ion microprobe (SHRIMP) from the Tagragra de Tata inlier in the western Anti-Atlas, Morocco establish Paleoproterozoic ages for the basement schists, granites, and metadolerites, and a Neoproterozoic age for an ignimbrite of the Ouarzazate Series in the cover sequence. The age of interbedded felsic metatuff in the metasedimentary and metavAuthorsG. J. Walsh, J. N. Aleinikoff, F. Benziane, A. Yazidi, T. R. ArmstrongBedrock geology in the vicinity of the Knowles and Andreas well sites, West Newbury, Massachusetts
No abstract available.AuthorsGregory J. WalshBedrock geology in the vicinity of the Rockland Avenue well site, Maynard, Massachusetts
No abstract available.AuthorsGregory J. WalshBedrock geologic map of the Hubbard Brook experimental forest, Grafton County, New Hampshire
No abstract available.AuthorsW. C. Burton, G. J. Walsh, T. R. ArmstrongContrasting methods of fracture trend characterization in crystalline metamorphic and igneous rocks of the Windham quadrangle, New Hampshire
The bedrock of the Windham quadrangle in southeastern New Hampshire consists of deformed early Palaeozoic crystalline metamorphic and intrusive igneous rocks intruded by Mesozoic igneous dikes. Generally, less common northeast striking, steeply dipping fractures developed sub-parallel to the pre-existing tectonic foliation in the Palaeozoic rocks. Mesozoic lamprophyre and diabase dikes intruded alAuthorsG. J. Walsh, S. F. ClarkBedrock geologic map of the Hubbard Brook experimental forest, Grafton County, New Hampshire
No abstract available.AuthorsW. C. Burton, G. J. Walsh, T. R. ArmstrongTectonic and regional metamorphic implications of the discovery of Middle Ordovician conodonts in cover rocks east of the Green Mountain massif, Vermont
Middle Ordovician (late Arenigian - early Caradocian) conodonts were recovered from a dolostone lens in carbonaceous schist 30 m below the base of the Pinney Hollow Formation in the Eastern Cover sequence near West Bridgewater, Vermont. These are the first reported fossils from the metamorphic cover sequence rocks east of the Green Mountain, Berkshire, and Housatonic massifs of western New EnglandAuthorsN. M. Ratcliffe, A. G. Harris, G. J. WalshU-Pb zircon age of metafelsite from the Pinney Hollow formation: Implications for the development of the Vermont Appalachians
The Pinney Hollow Formation of central Vermont is part of a rift-clastic to drift-stage sequence of cover rocks deposited on the Laurentian margin during the development of the Iapetan passive margin in Late Proterozoic to Cambrian time. Conventional U-Pb zircon data indicate an age of 571+ or -5 Ma for a metafelsite from the Pinney Hollow Formation. Geochemical data indicate that the protolith foAuthorsGregory J. Walsh, John AleinikoffBedrock geologic map of the Windham quadrangle, Rockingham and Hillsborough counties, New Hampshire
No abstract available.AuthorsG. J. Walsh, S. F. ClarkDigital bedrock geologic map of the Mount Carmel 7.5 x 15 minute quadrangle, Vermont
No abstract available.AuthorsNicholas M. Ratcliffe, Gregory J. WalshDigital bedrock geologic map of the Vermont part of the Hartland quadrangle, Windsor County, Vermont
No abstract available.AuthorsGregory J. WalshDigital and preliminary bedrock geologic map of the Mount Carmel quadrangle, Vermont
No abstract available.AuthorsNicholas M. Ratcliffe, Gregory 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