Photograph as originally submitted to this page in the Historical Marker Database www.HMdb.org. Click on photo to resize in browser. Scroll down to see metadata.
Mary
Photographer: Craig Swain
Taken: October 4, 2008
Caption: Mary's Rock Tunnel
Additional Description: The tunnel itself is cut through a section of what geologist call a Catoctin feeder dike, made from lava surging through a fissure in existing rock, over 1 billion years ago. The tunnels itself was blasted through the rock in 1932, then later lined with concrete to prevent ice formation. Sources vary as to the length of the tunnel. The marker states 700 feet. The map distance of the road is around 610 feet. The length of the rock cut is 690 feet. So take your pick for the length of the tunnel.
Submitted: November 2, 2008, by Craig Swain of Leesburg, Virginia.
Database Locator Identification Number: p42098
File Size: 1.655 Megabytes

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