Aquia Creek sandstone

Aquia Creek sandstone is a type of brown to light-gray freestone used extensively in building construction in Washington, D.C. in the late 18th and early 19th centuries. Quarried at Aquia Creek in Stafford County, Virginia, the stone was valuable for its ease of shaping and the quarry`s proximity to the tidewater portion of the Potomac River, 45 ....
Found on http://en.wikipedia.org/wiki/Aquia_Creek_sandstone
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