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Mineral Resources > Online Spatial Data > Geology > by state > Virginia Geology

Geologic units in Rockbridge county, Virginia

[Additional scientific data in this geographic area]

Conococheague Formation (Cambrian-Ordovician) at surface, covers 11 % of this area

Conococheague Formation - Limestone, dolomite, and calcareous sandstone.

Lithology: limestone; dolostone (dolomite); sandstone

Leucocratic Granulite and Gneiss (Proterozoic Y) at surface, covers 0.1 % of this area

Leucocratic granulite and gneiss.

Lithology: granulite; gneiss

Juniata, Oswego, Martinsburg (Reedsville and Dolly Ridge), and Eggleston Formations (Ordovician) at surface, covers 10 % of this area

Juniata, Oswego, Martinsburg (Reedsville and Dolly Ridge), and Eggleston Formations - Dusky-red shale and mudstone and sandstone; graywacke; shale and sandstone; and limestone.

Lithology: shale; mudstone; sandstone; graywacke; limestone

Valley and Ridge Igneous Intrusions; Peridotite (Jurassic-Tertiary) at surface, covers < 0.1 % of this area

Valley and Ridge Igneous Intrusions; p: Peridotite - Dikes in Augusta and Rockingham Counties: nepheline syenite, teschenite-syenite, and teschenite-picrite. Igneous bodies in Highland County: andesite and basalt.

Lithology: peridotite; syenite

Layered Pyroxene Granulite (Proterozoic Y) at surface, covers 2 % of this area

Layered pyroxene granulite

Lithology: granulite

Leucocharnockite (Proterozoic Y) at surface, covers 0.5 % of this area

Leucocharnockite

Lithology: granite

Martinsburg and Oranda Formations (Ordovician) at surface, covers 2 % of this area

Martinsburg and Oranda Formations - Shale, sandstone, siltstone, and limestone.

Lithology: shale; sandstone; siltstone; limestone

Conococheague Formation (Cambrian) at surface, covers < 0.1 % of this area

Conococheague Formation - Limestone, dolomite, and calcareous sandstone.

Lithology: limestone; dolostone (dolomite); sandstone

Shady Dolomite (Cambrian) at surface, covers 2 % of this area

Shady Dolomite - Dolomite.

Lithology: dolostone (dolomite); limestone; shale

Megacrystic Charnockite (Proterozoic Y) at surface, covers 0.9 % of this area

Megacrystic charnockite

Lithology: granite

Chilhowee Group (Cambrian) at surface, covers 10 % of this area

Chilhowee Group - Appalachian Plateaus and Valley and Ridge: Quartzite, conglomerate, feldspathic sandstone, phyllite, and minor ferruginous sandstone and volcanic rocks. Blue Ridge Anticlinorium: Conglomerate, quartzite, metasiltstone, and phyllite.

Lithology: quartzite; conglomerate; sandstone; phyllite; meta-argillite; volcanic rock (aphanitic)

Charnockite (Proterozoic Y) at surface, covers 0.4 % of this area

Charnockite.

Lithology: granitic gneiss

Charnockite Gneiss (Proterozoic Y) at surface, covers 0.2 % of this area

Charnockite gneiss

Lithology: gneiss

Brallier Formation (Devonian) at surface, covers 3 % of this area

Brallier Formation - Micaceous shale, siltstone, and sandstone.

Lithology: shale; siltstone; sandstone

Waynesboro Formation (Cambrian) at surface, covers 4 % of this area

Waynesboro Formation - Dolomite, dusky-red and green shale, limestone, and sandstone.

Lithology: dolostone (dolomite); shale; limestone; sandstone

Biotite Granodiorite and Biotite Granite (Proterozoic Z) at surface, covers < 0.1 % of this area

Biotite granodiorite, biotite granite

Lithology: granodiorite; granite

Chemung Formation (redefined as Foreknobs Formation) (Devonian) at surface, covers 0.2 % of this area

Chemung Formation - Shale and sandstone with a few thin, quartz-pebble conglomerates and red-beds.

Lithology: shale; sandstone; conglomerate

Beekmantown Group (Ordovician) at surface, covers 16 % of this area

Beekmantown Group - Dolomite, limestone, and chert. Includes Pinesburg Station Dolomite, Rockdale Run Formation, Beekmantown Formation, Stonehenge Limestone, and Chepultepec Formation.

Lithology: dolostone (dolomite); limestone; chert

Edinburg Formation, Lincolnshire and New Market Limestones (Ordovician) at surface, covers 13 % of this area

Edinburg Formation, Lincolnshire and New Market Limestones - Black limestone and shale; gray limestone, in part cherty

Lithology: limestone; black shale; chert

Millboro Shale and Needmore Formation (Devonian) at surface, covers 6 % of this area

Millboro Shale and Needmore Formation - Black, fissile shale; gray calcareous shale; Tioga metabentonite at top of Needmore.

Lithology: black shale; shale; bentonite; limestone

Ridgeley Sandstone, Helderberg and Cayugan Groups (Silurian-Devonian) at surface, covers 4 % of this area

Ridgeley Sandstone, Helderberg and Cayugan Groups - Calcareous sandstone; partly cherty limestone; calcareous shale; fossiliferous.

Lithology: limestone; sandstone; shale

Lower Devonian and Silurian Formations Undivided (Silurian-Devonian) at surface, covers 2 % of this area

Lower Devonian and Silurian Formations Undivided - Some landslides with intact stratigraphic units in Craig County area. Includes: Dsu, Skrt, Sm. (Shrc?)

Lithology: sandstone; limestone; shale

Keefer, Rose Hill, and Tuscarora Formations (Silurian) at surface, covers 5 % of this area

Keefer, Rose Hill, and Tuscarora Formations - Quartzarenite, dusky-red shale, and sandstone, Some landslides with intact stratigraphic units in Craig County area..

Lithology: arenite; shale; sandstone

Layered Porphyrobliastic Pyroxene Granulite (Proterozoic Y) at surface, covers 0.9 % of this area

Layered porphyroblastic pyroxene granulite

Lithology: granulite

Elbrook Formation (Cambrian) at surface, covers 8 % of this area

Elbrook Formation - Dolomite, shale, and minor limestone.

Lithology: dolostone (dolomite); limestone; shale; siltstone