The geology of Norfolk in eastern England largely consists of late Mesozoic and Cenozoic sedimentary rocks of marine origin covered by an extensive spread of unconsolidated recent deposits.
[1] The oldest rocks at or near the surface in Norfolk are late Jurassic mudstones and muddy limestones which underlie recent deposits in the area west of King's Lynn and Downham Market.
Overlying the Jurassic is a Cretaceous sequence whose lowermost unit is the Wealden Group comprising mudstones, limestones, siltstones and sandstones and which extends in a band from Hunstanton southwards to south of the village of Southery.
[2] The larger part of Norfolk's bedrock geology is concealed beneath superficial deposits, the oldest of which is a spread of glacial till dating from the Anglian glaciation.
The fact that the Chalk scarp in East Anglia is much reduced in height compared to its outcrop in Lincolnshire and the Chiltern Hills has been put down to erosion by the Anglian icesheet which reached as far south as Essex.