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

Geologic units in Shenandoah county, Virginia

[Additional scientific data in this geographic area]

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

Brallier Formation - Micaceous shale, siltstone, and sandstone.

Lithology: shale; siltstone; sandstone

Upper and Middle Ordovician Formations Undivided (Ordovician) at surface, covers < 0.1 % of this area

Upper and Middle Ordovician Formations Undivided - Includes: Oun, Ous, Ou, Om, Okpl, Oeln, Oml, Ols.

Lithology: shale; sandstone; mudstone; limestone; siltstone; graywacke; chert

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

Elbrook Formation (Cambrian) at surface, covers 2 % of this area

Elbrook Formation - Dolomite, shale, and minor limestone.

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

Chemung Formation (redefined as Foreknobs Formation) (Devonian) at surface, covers 4 % 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 18 % 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 7 % of this area

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

Lithology: limestone; black shale; chert

Ridgeley Sandstone, Helderberg and Cayugan Groups (Silurian-Devonian) at surface, covers 11 % of this area

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

Lithology: limestone; sandstone; shale

Millboro Shale and Needmore Formation (Devonian) at surface, covers 2 % 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

Lower Devonian and Silurian Formations Undivided (Silurian-Devonian) at surface, covers 0.1 % 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

Mahantango Formation (Devonian) at surface, covers 5 % of this area

Mahantango Formation - Sandstone with interbedded shale, fossiliferous

Lithology: sandstone; siltstone; shale

Massanutten Sandstone (Silurian) at surface, covers 5 % of this area

Massanutten Sandstone - Quartzarenite with lenses of conglomerate.

Lithology: arenite; quartzite; conglomerate

Juniata, Oswego, Martinsburg (Reedsville and Dolly Ridge), and Eggleston Formations (Ordovician) at surface, covers 4 % 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

Hampshire Formation (Devonian) at surface, covers 2 % of this area

Hampshire Formation - Dusky-red to grayish-red shale, mudrock, and sandstone.

Lithology: sandstone; limestone; shale

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

Conococheague Formation - Limestone, dolomite, and calcareous sandstone.

Lithology: limestone; dolostone (dolomite); sandstone

Juniata and Oswego Formations (Ordovician) at surface, covers < 0.1 % of this area

Juniata and Oswego Formations - the Juniata is a thin-bedded, blocky, red sandstone and shale. In places it is underlain by the thick-bedded, gray Oswego Sandstone.

Lithology: sandstone; shale

Lower Devonian, Silurian and Upper Ordovician Formations Undivided (Ordovician-Devonian) at surface, covers 0.2 % of this area

Lower Devonian, Silurian and Upper Ordovician Formations Undivided - Some landslides with intact stratigraphic units in Giles County. Includes: Skrt, Sm, Oun, Ous, Ou, Om. (Shrc, Okpl?)

Lithology: sandstone; shale; siltstone; limestone; mudstone; quartzite; arenite

Tuscarora Sandstone (Silurian) at surface, covers 0.2 % of this area

Tuscarora Sandstone - medium- to thick-bedded, white to gray or pinkish sandstone, fine to coarse, quartzitic, ridge-forming. Equivalent to the Clinch Sandstone of Tennessee.

Lithology: sandstone

Martinsburg Formation (Ordovician) at surface, covers < 0.1 % of this area

Martinsburg Formation - predominantly gray to dark shale, yellowish in the upper portion. Contains scattered thin limestone and sandstone interbeds, particularly in the lower portion. The upper portion constitutes the Reedsville Shale.

Lithology: shale; limestone; sandstone

Silurian and Upper Ordovician Formations Undivided (Ordovician-Silurian) at surface, covers 0.1 % of this area

Silurian and Upper Ordovician Formations Undivided - Includes: Skrt, Sm, Oun, Ous, Ou, Om. (Shrc and Okpl?)

Lithology: sandstone; shale; siltstone; limestone; mudstone; quartzite; arenite

Marcellus Shale and Needmore Formation (Devonian) at surface, covers 4 % of this area

Marcellus Shale and Needmore Formation - Black, fissile shale; gray, non-fissile shale; Tioga metabentonite at top of Needmore

Lithology: black shale; shale; bentonite; limestone

Martinsburg and Oranda Formations (Ordovician) at surface, covers 17 % of this area

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

Lithology: shale; sandstone; siltstone; limestone