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Hecatera dysodea
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Essex Field Club
Essex Field Club
registered charity
no 1113963
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We are normally open to the public at our centre at Wat Tyler Country Park every Saturday, Sunday and bank holiday between 11am and 4pm. We are also usually open on Wednesdays between 10am and 4pm.

Spring recording Record your Robin Record Common Frog Rana temporaria
Record Alexanders Smyrnium olusatrum Record Tawny Mining Bee Andrena fulva
Record Dark-edged Bee Fly Bombylius major
Record Spring Flower Bee Anthophora plumipes
Record cuckoo bee Melecta albifrons

Geology Site Account


Hatfield Forest erratic boulders , HATFIELD FOREST, Uttlesford District, TL541198, Potential Local Geological Site

 
 
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Site name: Hatfield Forest erratic boulders

Grid reference: TL 541 198

Brief description of site:

Between Takeley and Bishop’s Stortford lies Hatfield Forest, 1,100 acres of medieval woodland owned by the National Trust. On the southern edge of the lake were four large partially-submerged boulders, two of Hertfordshire puddingstone and two of sandstone. Two of the puddingstone boulders have now been moved next to the Shell House. The boulders were discovered when the lake was created in about 1750. The two largest boulders are about 1.4 metres (4’6”) long.

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Details

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. These boulders may have been picked up by the Anglian Ice Sheet from the gravel and dumped here when the ice melted.

The sandstone boulders have not been identified. They do not appear to be sarsen stones.

Adjacent to the Shell House a boulder of limestone(?) (80 cm by 45 cm) protrudes from the ground.



Two boulders of puddingstone next to the Shell House in Hatfield Forest. Photo: G. Lucy

 

Flint fossil shells used to make a model bird on the Shell House
Flint fossil shells used to make a model bird on the Shell House

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Reference: Lucy 2003a

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