London— Britain’s hottest summer in decades has revealed cropmarks across the country showing the sites of Iron Age settlements, Roman farms and even Neolithic monuments dating back thousands of years, archaeologists said on Wednesday. Cropmarks — patterns of shading in crops and grass seen most clearly from the air — form faster in hot weather as the fields dry out, making this summer’s heatwave ideal for discovering such sites. Archaeologists at the public body Historic England have been making the most of the hot weather to look for patterns revealing the ancient sites buried below, from Yorkshire in the north down to Cornwall in the south-west.

"We’ve discovered hundreds of new sites this year spanning about 6,000 years of England’s history," said Damian Grady, aerial reconnaissance manager at Historic England. "Each new site is interesting in itself, but the fact we’re finding so many sites over such a large area is filling in a lot of gaps in knowledge about how people l...

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