- Usage in publication:
-
- Horse Branch Member
- Modifications:
-
- Named
- Dominant lithology:
-
- Schist
- Metasiltstone
- Metasandstone
- Metaquartzite
- AAPG geologic province:
-
- Piedmont-Blue Ridge province
Summary:
Named as member of Ammons Formation in Great Smoky Group of Ocoee series. Named for Horse Branch, a tributary of Panther Creek, about 0.5 km south of NC Rte 28. Consists of black, laminated schist without porphyroblasts, and dark, thinly bedded to laminated metasiltstone. Beds of metasandstone resembling upper part of Ammons Formation are poorly exposed. [Description also implies presence of indistinctly banded, bluish-white metaquartzite and thinly bedded to laminate, spangled schist with porphyroblasts.] Unit grades into upper part of Ammons both vertically and laterally. Report contains geologic sketch map and correlation chart. Age is late Precambrian.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Horse Branch Member
- Modifications:
-
- Overview
- AAPG geologic province:
-
- Piedmont-Blue Ridge province
Summary:
Metasandstone, metagraywacke, metasiltstone, and mica schist are lumped together as one unit within Late Proterozoic Great Smoky Group in Blue Ridge belt. Unit includes Hughes Gap and Hothouse Formations in southern area, Horse Branch Member of Ammons Formation and Grassy Branch Formation in northern area. [Copied from map text, is ambiguous about the rest of the Ammons.]
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 ([ ]).