These special and ancient features appeared as you see this one here about 11,500 years ago. Len's of Ice formed some 20,000 years ago by pressing into the earth, soil covered these formations to create a small hillock. When the Ice from the Ice Age retreated the lens of ice melted and the hillock collapsed, thus forming the Pingo as you see here.
It is indeed wonderful to see these ancient features survive the onslaught of the human race, it is also wondrous to see these features in the Breckland landscape remain unchanged for 11,500 years.
|A Pingo near Thompson, Norfolk|
|Pingo - unchanged in 11,500 years|