- Usage in publication:
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- Lake George Group
- Modifications:
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- Named
- Dominant lithology:
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- Gneiss
- AAPG geologic province:
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- Adirondack uplift
Summary:
Metamorphosed sedimentary rocks in the Adirondacks are here named the Lake George Group. In the eastern Adirondacks it contains, in ascending order, the Eagle Lake Gneiss, Paradox Lake, Treadway Mountain, Lake Durant, Springhill Pond, and Thunderbolt Mountain Formations. In the southern Adirondacks it contains the Sacandaga, Lake Durant, and Tomany Mountain Formations, Rooster Hill Megacrystic Gneiss, Peck Lake and Green Lake Formations, Canada Lake Charnockitic Gneiss, and Irving Pond Formation. In the central Adirondacks the Cedar River, Lake Durant, Blue Mountain Lake, and Little Moose Mountain Formations are correlated with the southern Adirondack sequence. [These units are not specifically assigned to the Lake George Group.] Unconformably overlies the Piseco Group and is correlative with the Oswegatchie Group in the Northwest Lowlands. Regional metamorphism occurred during the Grenville Orogeny. Age is Proterozoic.
Source: GNU records (USGS DDS-6; Reston GNULEX).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).