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The extreme heat that has been recorded in the UK in recent weeks has been accompanied by good news for British archaeologists, who have discovered strange green circles in the middle of dry fields in Wales, reports Earther. According to archaeologists from the Royal Commission for Ancient and Historic Monuments of Wales (RCAHMW), who photographed the airmarks, these circles, as well as other geometric figures that appear in the area, are traces of ancient constructions. dating back to the Iron Age (800 BC), including houses, castles and farms.
During the iron age, the buildings of Wales were surrounded by ditches that served as a line of defense against potential invaders. Over time, new layers of land were added to these excavations, making the areas on which the constructions were built more fertile. In this way, these parcels of land were able to conserve water.
While drought drained water from other plots, these more fertile lands kept the green color, showing the outline of old buildings.
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