LONDON, July 13 (Xinhua) -- Britain's heatwave has revealed new sites in Scotland once occupied by Iron Age settlers and Roman invaders, cultural agency Historic Environment Scotland (HES) revealed Friday.

Crop marks showing ancient settlements and Roman fortifications, which are usually hidden under ploughed soil are now visible and are being documented by HES experts.

Newly discovered sites revealed by an aerial survey team during the recent warm weather include Iron Age souterrains in the Scottish region, a rare find in that part of Scotland, and a Roman temporary camp.

The camp was discovered within the known Roman complex of sites at Lyne near Peebles and adds to the significance of the complex, which already includes two forts and two additional temporary camps.

A HES spokesperson said: "The extensive marks form as the crops respond to dry conditions and have allowed the team to document known sites that have not been visible for many years."

Iron Age burials, Neolithic pits and prehistoric settlements are all marked out in the fields, against a backdrop of long-infilled rivers and streams which tell the story of Scotland's landscape, say HES.

Dave Cowley, HES aerial survey project manager, said: "Aerial surveys of Scotland have been carried out since the 1930s, with each year usually adding a little more to the patchwork of our knowledge.

"We depend on dry years to bring out the buried remains in the crops, so we are currently out hunting for new clues from the skies while the good weather lasts. The conditions this year are showing us many sites that we knew were there, but may not have seen in recent damp summers, as well as revealing new archaeological sites that add to our ability to see into the past to tell Scotland's story."

The HES aerial survey team search Scotland from the sky in order to understand and record Scotland's historic environment, and have discovered and recorded more than 9,000 buried sites to date.