USGS Visual Identifier
National Geologic Map Database logo GEOLEX database

Geologic Unit: Ratlum Mountain

Ratlum Mountain Schist (CT*)
Ratlum Mountain Member of Satans Kingdom Formation (CT)

Ordovician, Early(?)*
Geologic Province:
New England province*
Areal Extent:

Type Locality:
North of Diters Road on Ratlum Mountain, Collinsville quadrangle, northwestern CT (Stanley, 1964).
Reference localities: in Satans Kingdom and along gorge of Farmington River, south of Route 44 (Satans Kingdom access area) (Stanley, 1964).

Unit Name History:
Name proposed for member of Satans Kingdom Formation (Stanley, 1964).
Age modified (Hatch and Stanley, 1973).
Rank raised; Age modified (Rodgers, 1985).

Note: If you need more information, please contact Nancy Stamm (
Asterisks (*) indicate usage by the U.S. Geological Survey. Other usages by state geological surveys.

"No current usage" implies that a name has been abandoned or that it has fallen into disuse. Former usage and, if known, replacement name given in parentheses ().

Slashes (/) indicate unit name usage violates the 1983 North American Stratigraphic Code. This violation may be explained within brackets ([ ]).

U.S. Department of the Interior, U.S. Geological Survey, Reston, VA, USA
Database project personnel
Last modified: 15-Jan-2013