Lincolnshire Limestone Formation
Stratigraphic range: Bajocian

PreЄ

Type| Geological formation
Unit of| Inferior Oolite Group
Sub-units| Upper Lincolnshire Limestone Member, Lower Lincolnshire Limestone Member
Underlies| Rutland Formation, Great Oolite Group or Hunstanton Formation, Chalk Group
Overlies| Grantham Formation, Northampton Sand Formation or Lias Group
Thickness| 0-30 m
Lithology
Primary| Limestone
Other| Sandy limestone, mudstone
Location
Region| Market Weighton to Kettering, Peterborough
Country| England
Type section
Named for| Lincolnshire

The Lincolnshire Limestone Formation is a geological formation in England, part of the Inferior Oolite Group of the (Bajocian) Middle Jurassic strata of eastern England.[1] It was formed around 170 million years ago, in a shallow, warm sea on the margin of the London Platform and has estuarine beds above and below it. There are two sub-divisions, the Upper and Lower Lincolnshire Limestone.

It is typically about 30 m thick, reaching a maximum of over 40 m in south Lincolnshire. The lower division varies in thickness between 15 m and 21 m and the upper is typically between 10 m and 16 m thick.[2]

The dividing marker is the 'Crossi' bed which is distinguished by the fossils of the brachiopod Acanthothris crossi it contains. The Crossi bed forms the top of the Lower Lincolnshire limestone. The bottom of the Lower Lincolnshire limestone has some of the characteristics of the underlying Lower Estuarine Series, in that it tends to contain more than usual amounts of sand. A stone from this part of the formation which was commercially exploited is the Collyweston stone slate which was used for roofing for several centuries. It is now largely replaced in new work by concrete imitations.

Much of the rest of the Lower Lincolnshire limestone is oolitic. It formed in warm, shallow seas where evaporation concentrated the dissolved calcium carbonate and then the precipitated material formed concentric layers building up around a nucleus of, usually, a shell fragment as the sea surface was disturbed by winds rolling the sea-bed material around: the resulting little rounded balls are called ooliths or ooids.

## Contents

* 1 See also
* 2 References
* 2.1 Bibliography
* 2.2 External links

## See also

* Oolite
* List of types of limestone
* Ancaster stone
* Castle Bytham Quarry
* Collyweston stone slate

## References

1. ↑ "Lincolnshire Limestone Formation". The BGS Lexicon of Named Rock Units. British Geological Survey. http://www.bgs.ac.uk/lexicon/lexicon.cfm?pub=LL. Retrieved 29 March 2015.
2. ↑ "Baseline Report Series: 23. The Lincolnshire Limestone". Environment Agency. 2006. https://nora.nerc.ac.uk/id/eprint/3557/1/CR06060N.pdf.

### Bibliography

* Hains, B.A. & Horton, A. British Regional Geology Central England 3rd edn. (1969) ISBN 0-11-880088-4

### External links

* Darren Withers, David M. Martill, Roy E. Smith, Michael Ashton, Anusuya Chinsamy, Charles Wood, Richard Forrest. A large pterosaur from the Middle Jurassic (lower Bajocian) of Rutland, United Kingdom // Proceedings of the Geologists' Association, Volume 135, Issue 6, December 2024, Pages 660-675

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