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Lithophane ornitopus
find out more... Grey-shoulder Knot  Lithophane ornitopus 2 Copyright: Graham Ekins

Essex Field Club
Essex Field Club
registered charity
no 1113963
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EFC Centre at Wat Tyler Country ParkWe are normally open to the public at every Saturday, Sunday and bank holiday 11am-4pm, check. We are also open on Wednesdays 10am-4pm.
Early Summer recording Record Red-and-Black Froghopper Record Lavender Beetle
Record Stag Beetle
Record Misumena crab spider
Record Lily Beetle
Record Swollen-thighed Beetle Record Zebra Spider

Geology Site Account

Coopers End Farm Boulder, DUDDENHOE END, Uttlesford District, TL46493596, General geological site

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Site name: Coopers End Farm Boulder

Grid reference: TL 4649 3596

Brief description of site:

A large boulder of Hertfordshire puddingstone by the entrance to a plant hire company at Coopers End Farm, Duddenhoe End.



The boulder of Hertfordshire puddingstone at Coopers End Farm is of large size (1.6 metres x 1.4 metres x 55 cm) and is unusual as the base of the stone is without pebbles and therefore similar to a sarsen stone.

This boulder is a relatively new discovery, found only in 2008.

Hertfordshire Puddingstone was formed around 55 million years ago when the climate of Britain was hot and a layer of pebbles beneath the surface of the ground became cemented with quartz. They are thus very resistant to erosion and have survived the rigours of the Ice Age. They originated in Hertfordshire, hence the name, and were probably carried to Essex by the River Thames when it flowed north of its present course. However, the distribution and abundance of Hertfordshire puddingstone in parts of Essex suggests that some occurrences may have a local Essex source.

The formation of silcretes (which includes sarsens and puddingstones) has been the subject of recent scientific debate. Research has compared the conditions under which sarsens and puddingstones may have been formed with the present day climate in the Kalahari Desert and parts of Australia.


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