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Geologic units in Fannin county, Georgia

[Additional scientific data in this geographic area]

Quartzite (Precambrian-Paleozoic) at surface, covers 0.7 % of this area
Quartzite
Lithology: quartzite
Mineral Bluff Formation (Late Proterozoic) at surface, covers < 0.1 % of this area
Mineral Bluff Formation - quartz-chlorite-sericite schist and phyllite with thin quartzite layers and minor interbedded graphitic schist, garnet-mica schist, staurolite schist, cross-biotite schist, and dark slate.
Lithology: schist; phyllite; quartzite; slate
Mica Schist (Precambrian-Paleozoic) at surface, covers 11 % of this area
Mica Schist
Lithology: mica schist
Conglomerate (Precambrian-Paleozoic) at surface, covers 0.4 % of this area
Conglomerate
Lithology: conglomerate
Ocoee Supergroup, Great Smokey Group; Dean Formation (Late Proterozoic) at surface, covers < 0.1 % of this area
Dean Formation - sericite schist with cross-biotite, staurolite, and garnet porphyroblasts; interbedded metagraywacke and quartz-pebble metaconglomerate.
Lithology: mica schist; metasedimentary rock
Phyllite and Quartzite (Precambrian-Paleozoic) at surface, covers 0.3 % of this area
Phyllite and Quartzite
Lithology: phyllite; quartzite
Aluminous Schist (Precambrian-Paleozoic) at surface, covers 2 % of this area
Aluminous Schist
Lithology: schist
Murphy Marble, Andrews Formation, and Nottely Quartzite, undivided (Late Proterozoic) at surface, covers < 0.1 % of this area
Murphy Marble, Andrews Formation, and Nottely Quartzite, undivided - Murphy Marble: calcareous to dolomitic; Andrews Formation: calcareous cross-biotite schist; Nottely Quartzite: meta-orthoquartzite with slate.
Lithology: marble; schist; quartzite; slate
Nantahala Formation and Tusquitee Quartzite, undivided (Late Proterozoic) at surface, covers < 0.1 % of this area
Nantahala Formation and Tusquitee Quartzite, undivided - Nantahala Formation: slate and metasiltstone, dark gray, laminated to thin bedded, sulfidic; Tusquitee Quartzite: white to light yellowish gray, numerous, thin slate layers.
Lithology: slate; metasedimentary rock; quartzite
Ocoee Supergroup, Great Smokey Group; Metasandstone, Metagraywacke, Metasiltstone, and Mica Schist (Late Proterozoic) at surface, covers < 0.1 % of this area
Metasandstone, Metagraywacke, Metasiltstone, and Mica Schist - beds and lenses of calc-silicate rock locally abundant; garnet, staurolite, and cross-biotite porphyroblasts common in fine-grained layers. Includes Hughes Gap and Hothouse formations in southern area; Horse Branch Member of Ammons Formation and Grassy Branch Formation in northern area.
Lithology: metasedimentary rock; mica schist; calc-silicate rock
Ocoee Supergroup, Great Smokey Group; Copperhill Formation (Late Proterozoic) at surface, covers < 0.1 % of this area
Copperhill Formation - metagraywacke, massive, graded bedding common; includes dark-gray slate, mica schist, and nodular calc-silicate rock.
Lithology: metasedimentary rock; slate; mica schist; calc-silicate rock
Mica Schist/ Gneiss (Precambrian-Paleozoic) at surface, covers 37 % of this area
Mica Schist/ Gneiss
Lithology: mica schist; gneiss
Brasstown Formation (Late Proterozoic) at surface, covers < 0.1 % of this area
Brasstown Formation - cross-biotite schist; includes micaceous quartzite in lower part.
Lithology: mica schist; quartzite
Metagraywacke/ Mica Schist/ Calc-silicate Gneiss (Precambrian-Paleozoic) at surface, covers 4 % of this area
Metagraywacke/ Mica Schist/ Calc-silicate Gneiss
Lithology: metasedimentary rock; mica schist; gneiss
Metagraywacke undifferentiated (Precambrian-Paleozoic) at surface, covers 0.8 % of this area
Metagraywacke undifferentiated
Lithology: metasedimentary rock
Biotite Gneiss (Precambrian-Paleozoic) at surface, covers < 0.1 % of this area
Biotite gneiss
Lithology: biotite gneiss
Walden Creek Group, including Sandsuck Formation, Wilhite Formation, Shields Formation, and Licklog Formation (Cambrian) at surface, covers 0.1 % of this area
Walden Creek Group - The formations, other than the Sandsuck, are applicable mainly in the region of the Great Smoky Mountains. Thickness about 8,000 feet, Includes Sandsuck Formation - Olive-green and gray, argillaceous, micaceous shale with coarse feldspathic sandstone and quartz- pebble conglomerate. Thickness about 2,000 feet; Wilhite Formation - Gray to green siltstone and slate with interbeds of pebble conglomerate, sandstone, and quartzite. Thickness about 4,000 feet; Shields Formation - Massive conglomerate, sandstone, argillaceous slate; conglomerate (pebbles of various rock types) characteristic. Thickness about 1,500 feet.; Licklog Formation - Feldspathic sandstone, greenish phyllite, and bluish-gray slate. Thickness about 1,500 feet.
Lithology: shale; siltstone; sandstone; conglomerate; slate; quartzite; phyllite
Amphibolite (Precambrian-Paleozoic) at surface, covers 0.5 % of this area
Amphibolite
Lithology: amphibolite
Metagraywacke/ Mica Schist-Quartzite/ Amphibolite (Precambrian-Paleozoic) at surface, covers 24 % of this area
Metagraywacke/ Mica Schist-Quartzite/ Amphibolite
Lithology: metasedimentary rock; mica schist; quartzite; amphibolite
Slate/ Quartzite/ Conglomerate (Precambrian-Paleozoic) at surface, covers 9 % of this area
Slate/ Quartzite/ Conglomerate
Lithology: slate; quartzite; conglomerate
Cross-Biotite Schist (Precambrian-Paleozoic) at surface, covers 5 % of this area
Cross-Biotite Schist
Lithology: biotite schist
Great Smoky Group, including Anakeesta Formation, Thunderhead Sandstone, and Elkmont Sandstone (Precambrian) at surface, covers 0.2 % of this area
Great Smoky Group - Characterized by very massive layers of coarse graywacke and arkose. The formations have been mapped only in the region of the Great Smoky Mountains. Near Ducktown, in ascending order, the Copperhill, Hughes Gap, Hothouse, and Dean Formations are recognized. Thickness 14,000 to about 40,000 feet. Includes Anakeesta Formation - Dark-gray, bluish-gray, and black slate with dark-gray interbeds of fine-grained sandstone. Thickness 3,000 to 4,500 feet; Thunderhead Sandstone - Coarse, gray feldspathic sandstone, graywacke, and conglomerate; occurs in massive ledges; graded bedding and blue quartz characteristic. Thickness 5,500 to 6,300 feet; Elkmont Sandstone - Coarse to fine, gray feldspathic sandstone, graywacke, and fine conglomerate; generally finer grained beds in lower part; graded bedding typical. Thickness 1,000 to 8,000 feet
Lithology: graywacke; arkose; slate; sandstone; conglomerate
Ocoee Supergroup, Great Smokey Group; Wehutty Formation (Late Proterozoic) at surface, covers < 0.1 % of this area
Wehutty Formation - slate to schist, dark gray, graphitic and sulfidic; includes mica schist, metagraywacke, and metaconglomerate.
Lithology: slate; schist; metasedimentary rock
Graphitic Phyllite (Precambrian-Paleozoic) at surface, covers 3 % of this area
Graphitic Phyllite
Lithology: phyllite

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