Grantham Formation

Last updated
Grantham Formation
Stratigraphic range: Aalenian
O
S
D
C
P
T
J
K
Pg
N
Sproxton South Quarry - geograph.org.uk - 702693.jpg
Sproxton Quarry, a Reference Section for the Grantham Formation
Type Geological formation
Unit of Inferior Oolite Group
Underlies Lincolnshire limestone
Overlies Northampton Sand Formation, Whitby Mudstone Formation
Thickness2 to 5 m, locally 15 m in channels
Lithology
Primary Mudstone
Other Sandstone
Location
Region England
CountryFlag of the United Kingdom.svg  UK

The Grantham Formation is a geological formation in England, which dates to the Middle Jurassic Aalenian age around 172 million years ago. It is composed of mudstones and sandstone, usually with abundant plant debris. It overlies the preceding Northampton Sand Formation and underlies the following Lincolnshire Limestone. [1]

It is found from the Humber estuary to the Kettering/Peterborough area.

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References

  1. "The BGS Lexicon of Named Rock Units - Grantham Formation". British Geological Survey. Retrieved 15 November 2017.