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Comments on Gigapan: Gravel deposits on Adams Mill Road NW, DC

  2. Gravel deposits that overlie the eroded roots of the metamorphic Appalachian belt in Washington, DC. These gravels are well-rounded and poorly sorted, and contain clasts sourced to the Antietam Formation in the Blue Ridge. The age of the gravels is not entirely clear. They may be as old as Cretaceous, or perhaps "Terti...

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