If archaeological structures lying in the ground are partially destroyed by ploughing, the material is brought up to the surface and can be seen as a soilmark.
![The multi-period settlement site near Transport Lane, Loddon can be seen from the air as soilmarks](http://hbsmrgateway2.esdm.co.uk/norfolk/DataFiles/FullImages/960.jpg)
The multi-period settlement site near Transport Lane, Loddon can be seen from the air as soilmarks. (© NCC)