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Durdle Door is one of the Geological Society of London’s top #100Geosites. It is a natural rock arch on the south coast of England, west of Lulworth. If you ever go to Durdle Door, take the steps to the left down into Man O’ War cove – I saw my first ever palaeoraindrops here, and there are ancient ripple marks on the nearly vertical rockface on the right of the steps (as you come down them). There is also a mega nice sequence of vertical rocks, with a slight fold at the top. This bay also has organic carbon layers (!!) and generally, is really freakin’ cool and interesting if you’re a geonerd.