|Weeks of extreme heat and drought have baked Welsh fields to a crisp. But amidst the remains of crops, bizarre circles of green have emerged. It’s definitely not aliens. It’s the remains of ancient settlements emerging from centuries of slumber.|
These are crop marks, the modern answer to crop circles. Crop marks are relics of the Iron Age, a period which lasted from roughly 800 B.C. until 50 A.D., showing where forts and settlements once existed. Iron Age settlements in Wales were usually surrounded by ditches that acted as deterrents for would be invaders. Over time, those settlements were abandoned, top soil filled in the ditches, making them both more fertile than the surrounding land and able to retain water.