MARK BURNETT / SCIENCE PHOTO LIBRARY MARK BURNETT / SCIENCE PHOTO LIBRARY
Folded rock strata in Sideling Hill, revealed by the construction of Route 68 in Maryland, USA. The exposed rock is 260 metres high and formed around 350 million years ago. The downfold (syncline) of the rock suggests that a valley should have formed, rather than a ridge. However, sandstone caps the syncline and has prevented erosion.
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