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Unearth Pennsylvania's geological wonders


This rock formation, called Devil s Den, was the scene of fierce fighting during the Civil War s Battle of Gettysburg.Ad Crable
In a treeless plain on the edge of Gettysburg in southcentral Pennsylvania lies a jumble of dark and rounded boulders.
This “boulder city” is made up of diabase rock, a very hard igneous rock that ended up here 200 million years ago — originating as hot magma oozing to the surface from underground volcanoes. Within the last few centuries, it became known as Devil’s Den.
On a hot summer day in 1863, Confederate soldiers desperate for cover drove Union forces from the rocks, then squeezed into the cracks and fired on their rivals hiding behind another diabase outcropping at Little Round Top. ....

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