 The size of the habitable land would have varied through the different glacial and interglacial periods up until the end of the Anglian Stage, as would have the climate, flora and fauna, and the general landscape of Norfolk.The Anglian glaciation was the 3rd from last glacial stage and occurred between 400,000 and 500,000 years ago.This stage was the last time the ice sheets reached East Anglia and it resulted in the deposits known as the Corton Formation.