Historical Marker

Petrified Wood

Historical marker location:
The National Mall, District of Columbia
( Marker is on Madison Drive Northwest west of 9th Street Northwest, on the right when traveling west.)

Araucarioxylon Arizonicum Knowlton. Triassic Period

Washington, D.C. is 90 square miles, surrounded by reality.
Andrew Johnson in The Public Papers of the Presidents, 1865
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