Blisworth Clay Formation

The Blisworth Clay Formation is a geological formation in England. It is part of the Great Oolite Group and was deposited in the Bathonian stage of the Middle Jurassic. The predominant lithology is mudstone with thin beds of limestone and sandstone with ironstone nodules.^[1] Towards the South-West it laterally transitions into the Forest Marble Formation.

Blisworth Clay Formation
Stratigraphic range: Bathonian PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Unit of	Great Oolite Group
Underlies	Cornbrash Formation
Overlies	Blisworth Limestone
Thickness	up to 10 metres (30 ft) typically 2-4 metres
Lithology
Primary	Mudstone
Other	Sandstone, Limestone, Ironstone
Location
Region	Europe
Country	England
Extent	East Midlands
Type section
Named for	Blisworth