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aerial photograph showing the prehistoric landscape around Dumpdon Camp iron age hillfort , Dumpdon Hill, Devon England UK. Field patterns across the English landscape have evolved through millennia. The first fields were enclosed in prehistoric times, while the majority of the small irregular fields in this image probably date to the medieval period. The larger rectangular fields, such as those on the centre left of the photo, are more modern usually dating from the period of enclosure from the 16th to 19th century when common land was enclosed and became the property of one owner.