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Geologic units in Rappahannock county, Virginia

[Additional scientific data in this geographic area]

Catoctin Formation - Metabasalt (Proterozoic Z-Cambrian) at surface, covers 8 % of this area
Catoctin Formation - Metabasalt.
Lithology: meta-basalt
Robertson River Igneous Suite - Laurel Mills granite (Proterozoic Z) at surface, covers 7 % of this area
Robertson River Igneous Suite - Laurel Mills granite
Lithology: granite
Flint Hill Gneiss (Proterozoic Y) at surface, covers 12 % of this area
Flint Hill Gneiss - Gneiss.
Lithology: gneiss
Layered Pyroxene Granulite (Proterozoic Y) at surface, covers 21 % of this area
Layered pyroxene granulite
Lithology: granulite
Robertson River Igneous Suite - Amissville alkali feldspar granite (Proterozoic Z) at surface, covers 1.0 % of this area
Robertson River Igneous Suite - Amissville alkali feldspar granite
Lithology: granite
Robertson River Igneous Suite - Hitt Mountain alkali feldspar syenite (Proterozoic Z) at surface, covers 0.4 % of this area
Robertson River Igneous Suite - Hitt Mountain alkali feldspar syenite
Lithology: alkali syenite
Robertson River Igneous Suite; Battle Mountain Alkali Feldspar Granite - felsite (Proterozoic Z) at surface, covers 0.7 % of this area
Robertson River Igneous Suite - Battle Mountain Alkali Feldspar Granite - felsite
Lithology: felsic volcanic rock
Porphyroblastic Granite Gneiss (Proterozoic Y) at surface, covers 4 % of this area
Porphyroblastic granite gneiss
Lithology: granitic gneiss
Two-Mica Granite (Proterozoic Y) at surface, covers 1 % of this area
Two-mica granite.
Lithology: orthogneiss
Robertson River Igneous Suite - Arrington Mountain alkali feldspar granite (Proterozoic Z) at surface, covers 0.5 % of this area
Robertson River Igneous Suite - Arrington Mountain alkali feldspar granite
Lithology: granite
Swift Run Formation (Proterozoic Z) at surface, covers 0.3 % of this area
Swift Run Formation - Phyllite, metasandstone, and metaconglomerate.
Lithology: phyllite; sandstone; meta-conglomerate; schist; quartzite; slate
Fauquier Formation - Metasiltstone and phyllite (Proterozoic Z) at surface, covers < 0.1 % of this area
Fauquier Formation - Meta-argillite is laminated metasiltstone; and phyllite.
Lithology: meta-argillite; phyllite
Alkali Feldspar Leucogranite (Proterozoic Y) at surface, covers 0.8 % of this area
Alkali feldspar leucogranite
Lithology: granite
Lynchburg Group; Metagraywacke (Proterozoic Z) at surface, covers 2 % of this area
Lynchburg Group - Metagraywacke
Lithology: meta-argillite; schist; conglomerate
Layered Biotite Granulite and Gneiss (Proterozoic Y) at surface, covers < 0.1 % of this area
Layered biotite granulite and gneiss.
Lithology: gneiss; granulite
Robertson River Igneous Suite - Battle Mountain granite (Proterozoic Z) at surface, covers 4 % of this area
Robertson River Igneous Suite - Battle Mountain granite
Lithology: granite
Charnockite (Proterozoic Y) at surface, covers 0.1 % of this area
Charnockite.
Lithology: granitic gneiss
Charnockite Gneiss (Proterozoic Y) at surface, covers 9 % of this area
Charnockite gneiss
Lithology: gneiss
Fauquier Formation - Arkosic metasandstone (Proterozoic Z) at surface, covers 2 % of this area
Fauquier Formation - Arkosic metasandstone
Lithology: metasedimentary rock
Fauquier Formation -Meta-arkose and metasiltstone (Proterozoic Z) at surface, covers 1 % of this area
Fauquier Formation - Crossbedded metasandstone
Lithology: metasedimentary rock
Mylonite, Mylonite Gneiss, and Cataclastic Rocks (Proterozoic - Paleozoic ?) at surface, covers 2 % of this area
Mylonite, mylonite gneiss, and cataclastic rocks.
Lithology: mylonite; gneiss; cataclastite
Marshall Metagranite (Proterozoic Y) at surface, covers 0.4 % of this area
Marshall Metagranite - Medium-granied biotite metagranite
Lithology: granite
Porphyoblastic Biotite-Plagioclase Augen Gneiss (Proterozoic Y) at surface, covers 23 % of this area
Porphyoblastic biotite-plagioclase augen gneiss
Lithology: augen gneiss

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