Mineral Resources On-Line Spatial Data
Mineral Resources > Online Spatial Data > Geology > by state > Vermont
|Original map label||Oa|
|Comments||Part of Eastern Vermont. U-Pb zircon ages suggest that the Ammonoosuc Volcanics and tuffs of the Partridge Formation were erupted 453 to 449 Ma meaning they are of late Middle Ordovician and earliest Late Ordovician age. The stratigraphic relationships of these two units is very complex with current thought being that the Partridge lies between the lower and upper members of the Ammonoosuc Volcanics per VT010.|
|Primary rock type||tuff|
|Secondary rock type||volcanic breccia (agglomerate)|
|Other rock types||lava flow|
Igneous > Volcanic > Felsic-volcanic > Rhyolite (Flow)Soda-rhyolite tuff, breccia, and flows.
Igneous > Volcanic > Felsic-volcanic > Rhyolite (Volcaniclastic, volcanic breccia)Soda-rhyolite tuff, breccia, and flows.
Igneous > Volcanic > Felsic-volcanic > Rhyolite (Pyroclastic, tuff)Soda-rhyolite tuff, breccia, and flows.
Nicholson, S.W., Dicken, C.L., Horton, J.D., Foose, M.P., Mueller, J.A.L., and Hon, Rudi, 2006, Preliminary integrated geologic map databases for the United States: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, Rhode Island, and Vermont: U.S. Geological Survey Open-File Report 2006-1272.
Doll, C.G., Cady, W.M., Thompson, J.B., Jr., and Billings, M.P., 1961, Centennial Geologic Map of Vermont: Vermont Geological Survey, Miscellaneous Map MISCMAP-01, scale 1:250,000.
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