Harwich Formation
Stratigraphic range: Ypresian

Type| Formation
Unit of| Thames Group
Sub-units| Blackheath Member
Underlies| London Clay Formation
Overlies| Lambeth Group
Thickness| <2-24 m
Lithology
Primary| sand, silt & clay
Other| gravel
Location
Region| southeastern England
Country| United Kingdom
Extent| London Basin
Type section
Named for| Harwich

The Harwich Formation is a geological formation found in the London Basin of southeastern England . It is Ypresian (early Eocene) in age. It lies unconformably on the Lambeth Group over most of its extent, but may overlie either the Thanet Formation or the Chalk Group to the south. It is overlain by the London Clay Formation.[1]

## References

1. ↑ "Harwich Formation". The BGS Lexicon of Named Rock Units. British Geological Survey. http://www.bgs.ac.uk/lexicon/lexicon.cfm?pub=HWH. Retrieved 31 July 2016.

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