Site of Special Scientific Interest
The clay pit at W H Collier is classed as a Site of Special Scientific Interest (SSSI). This is due to the uniquely important Pleistocene sediments, which have yielded a continuous pollen record through the entire Hoxnian Interglacial period.
Our active quarry forms a very important part of England’s geological resource. This is because the quarrying process has exposed vertical sections of clay not normally visible in a natural state.