Glacial Till
Also called Lowestoft Till or chalky boulder clay, this is a chalky bluish-grey to brown clay that is variably silty, sandy and stony. Chalk fragments and flints are ubiquitous, with occasional sandstone erratics and fossils such as belmnites . The material was deposited by the retreating glaciers of the Anglian Glaciation (qv) and covers a broad diagonal band across central Suffolk, extending from Haverhill to Lowestoft. The deposit is thickest in the Chedburgh/Rede area where thicknesses in excess of 50m have been proved by boreholes