Marker Logo HMdb.org THE HISTORICAL
MARKER DATABASE
“Bite-Size Bits of Local, National, and Global History”
“Bite-Size Bits of Local, National, and Global History”
Near Hancock in Washington County, Maryland — The American Northeast (Mid-Atlantic)
 

Round Top Geology

Chesapeake and Ohio Canal National Historical Park

 
 
Round Top Geology Marker image. Click for full size.
By Bernard Fisher, July 22, 2016
1. Round Top Geology Marker
Inscription. The layers of red sandstone, siltstone, shale and limestone beneath the limekilns on the other side of the canal are like pages in a book to geologists. These folded, even rock layers indicate that millions of years ago this area was covered by a shallow sea. As the waters swelled and retreated, due to climatic change and tectonic plate movement, the colorful layers of sedimentary rock were exposed.

The rocks also tell a story of a violent collision between the North American and African tectonic plates over 240 million years ago—the same collision that formed the Appalachian mountain chain The force of the impact caused the rocks to fold and fault, creating the anticline or upward arch in the rock layers visible under the kilns.

(caption)
Canal engineers discovered high calcium limestone in Round Top during construction in the 1830s. By 1838 Round Top Cement Company began mining operations here. This photograph shows an anticline after the layers of limestone were removed.

Down the towpath 200 yards to your right is Devilís Eyebrow, a hollow that formed when the soft, lower layers of calcium-rich rock eroded leaving the more resistant harder layers of the anticline intact.
 
Erected by National Park Service, U.S. Department of the Interior
Round Top Geology Marker image. Click for full size.
By Bernard Fisher, July 22, 2016
2. Round Top Geology Marker
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Marker series. This marker is included in the Chesapeake and Ohio Canal marker series.
 
Location. 39° 40.629′ N, 78° 13.597′ W. Marker is near Hancock, Maryland, in Washington County. Marker can be reached from Canal Street 3.1 miles west of South Pennsylvania Avenue. Touch for map. Located on the C&O Canal Towpath. Marker is in this post office area: Hancock MD 21750, United States of America.
 
Other nearby markers. At least 8 other markers are within 2 miles of this marker, measured as the crow flies. Round Top Cement Mill (here, next to this marker); a different marker also named Round Top Cement Mill (within shouting distance of this marker); Round Top Heritage Area (about 700 feet away, measured in a direct line); Round Top Sand Company (approx. 0.2 miles away); Lovers' Leap (approx. 1.7 miles away in West Virginia); “Old Mr. Flintís” Home (approx. 1.9 miles away); National Pike Toll House (approx. 2 miles away); Tonoloway Fort (approx. 2 miles away). Touch for a list and map of all markers in Hancock.
 
Also see . . .  Chesapeake & Ohio Canal National Historical Park. National Park Service (Submitted on July 25, 2016.) 
 
Categories. Industry & Commerce
 
Devil's Eyebrow image. Click for full size.
By Bernard Fisher, July 22, 2016
3. Devil's Eyebrow
 
 
Credits. This page was last revised on July 25, 2016. This page originally submitted on July 25, 2016, by Bernard Fisher of Mechanicsville, Virginia. This page has been viewed 131 times since then and 33 times this year. Photos:   1, 2, 3. submitted on July 25, 2016, by Bernard Fisher of Mechanicsville, Virginia.
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