The Sideling Hill is a long, steep, narrow mountain ridge that runs north to south across western Maryland in Washington County, in the United States. For many centuries, this mountain had blocked the path of many travellers who wished to go from Maryland to northeast West Virginia and vice versa.
Then the Maryland State Highway Administration decided to cut a deep notch across the hill and lay the road through it. After excavating 10 million tons of rock, engineers discovered they had exposed an unusual geologic structure - a syncline of tightly folded rock strata dating back more than 350 million years.
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