- Usage in publication:
-
- Hancock member
- Modifications:
-
- Named
- Dominant lithology:
-
- Schist
- Granulite
- Marble
- AAPG geologic province:
-
- New England province
Summary:
Named the Hancock member of the Pinney Hollow formation for Hancock Tunnel in Rochester-East Middlebury area, west-central VT. Consists of dark-green albite-epidote-calcite-chlorite schist occurring in middle of Pinney Hollow formation. West of Hancock, thin beds of white quartz-tremolite-calcite granulite are interstratified with schist; locally, thin discontinuous beds of buff-weathering dolomitic marble are present. Thickness is approximately 500 feet in vicinity of Rochester and Hancock and thins to 200 feet toward northern border of Rochester quad. The Hancock is of Early Cambrian age.
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 ([ ]).