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Bedrock map of Fairfax County, Virginia
Avery A. Drake Jr., A.J. Froelich
1977, Open-File Report 77-523
The generalized rock-type of lithologic map separates the firm consolidated bedrock that underlies most of Fairfax County into thirteen (13) major rock types; each type groups rock units with grossly similar physical characteristics.  Although crystalline bedrock underlies the Coastal Plain deposits of Eastern Fairfax County, it was not subdivided on...