The GEOLOGY OF SUFFOLK in eastern
* 1 Cretaceous * 2 Palaeogene * 3 Neogene * 4 Quaternary * 5 See also * 6 References
The oldest rocks exposed at the surface in
There are isolated pockets of
Palaeocene sands and clays north of
From Bury St Edmunds and Sudbury eastwards the Chalk is overlain by an extensive spread of Pliocene to Pleistocene age 'crag' stretching to the North Sea coast. Slightly older deposits known as Corralline Crag occur in the vicinity of Aldeburgh and Orford .
A veneer of glacial till is widespread across Suffolk, dating from the Anglian glaciation. Sands and gravels of uncertain origin are common in the river valleys and the coastal plain whilst river terrace deposits have been mapped along the valleys of the rivers Stour , Waveney and Gipping for instance. Estuarine and marine alluvium is spread across the eastern coastal zone whilst at the other side of the county areas of peat and lake clays, silts and sands occur.
* ^ British Geological Survey 1:50,000 scale geological map series
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