Pingo's

The creation of Pingo's began some 20,000 years ago during the last Ice Age.  In the UK these are a rare feature in the landscape, but here in the Breckland area of Norfolk, we boast the greatest density with some 700+ Pingo's.
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