- Usage in publication:
-
- Montezuma schist*
- Modifications:
-
- Named
- Dominant lithology:
-
- Schist
- AAPG geologic province:
-
- Piedmont-Blue Ridge province
Summary:
Named for Montezuma, Cranberry quad, Mitchell Co., western NC. Consists of fine-grained epidotic and chloritic schists and amygdaloids of very uniform appearance. Schists is bluish black, gray, or green where fresh, becoming more green or yellowish green where weathered. Amygdaloid beds occur chiefly along northwest areas of formation and consist of bluish-gray groundmass with pea-sized cavities filled with quartz, feldspar, and epidote. Age is Precambrian (Algonkian).
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Montezuma member*
- Modifications:
-
- Revised
- Age modified
- AAPG geologic province:
-
- Piedmont-Blue Ridge province
Summary:
Montezuma schist of Keith (1903) here reduced in rank to Montezuma member of Grandfather Mountain formation. Age refined from Precambrian to late Precambrian. Unit is intercalated with rocks in upper part of Grandfather Mountain formation. Consists of green, blue-green, or blue-gray, fine-grained metabasalt (greenstone or greenschist). Underlain by greenish-gray, metamorphosed, porphyritic quartz-latite of Grandfather Mountain formation near eastern margin of Linville quad.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Montezuma Member
- Modifications:
-
- Age modified
- AAPG geologic province:
-
- Piedmont-Blue Ridge province
Summary:
Age revised from late Precambrian to Late Proterozoic in accordance with common subdivisions of Precambrian time. [Crossnore Complex not used on this map; Grandfather Mountain Formation and Montezuma Member not assigned to any higher ranking unit.]
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 ([ ]).