The Elbrook Formation is a geologic formation in Virginia, West Virginia, Maryland, and Pennsylvania. It dates back to the Cambrian period. Fossils of trilobite fragments have been discovered, but they are rare. The Elbrook Formation is not considered fossiliferous.
The Elbrook is described in southern Virginia as light-gray to dark bluish-gray, thin-bedded, fine-grained dolomite with some dark bluish-gray magnesian limestone and light-green to dark-gray shale, and rare red shale.Amato, 1974. Geology of the Salem Quadrangle, Virginia. Virginia Division of Mineral Resources. Report of Investigations 37. With geologic map and cross sections.
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