- Usage in publication:
-
- Barrow Hill Formation*
- Modifications:
-
- Named
- Dominant lithology:
-
- Quartzite
- Schist
- Amphibolite
- AAPG geologic province:
-
- Piedmont-Blue Ridge province
Summary:
The Barrow Hill Formation in the Clarkston slice of the Atlanta thrust sheet is here named. It consists of thin layers of blocky, sooty-weathering gondite (spessartine quartzite) intercalated with pink- to purple-weathering garnet-sillimanite-biotite-muscovite schist and ochre-weathering amphibolite. The gondite was formerly named the Intrenchment Creek Quartzite, which is here abandoned. Overlies the Ison Branch Formation with probable gradational contact and grades upward into the Clarkston Formation. Age is Late Proterozoic to Early Ordovician(?).
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 ([ ]).