A mound of fire-cracked stones, normally accompanied by a trough or pit which may have been lined with wood, stone or clay. Assumed to be locations where heated stones were used to boil water primarily for cooking purposes.
![Prehistoric flint pot boilers](http://hbsmrgateway2.esdm.co.uk/norfolk/DataFiles/FullImages/973.jpg)
Prehistoric fire cracked stones from Middleton. (© NCC)