Barnack Hills and Holes , otherwise known as Hills and Hollows this is a National Nature Reserve . Its undulating mounds are the result of limestone quarrying in medieval times. The stone that was quarried here was Lincolnshire Limestone from the Jurassic period (205-142 million years ago). Known as Barnack Rag, it is a buff-yellow limestone that has been extensively quarried in the area since Roman times and was used in the construction of many of the local village houses and most impressively for both Peterborough and Ely Cathedrals.

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