Essex Field Club on Facebook

Video about the Club Essex Field Club video

Pammene trauniana
find out more... Pammene trauniana 2 Copyright: Ben Sale

Essex Field Club
Essex Field Club
registered charity
no 1113963
HLF Logo A-Z Page Index


Essex Field Club

When you shop at Amazon DonatesAmazon Donates

Visit Our Centre

EFC Centre at Wat Tyler Country ParkWe are closed due to the Covid-19 situation, but we are otherwise normally open to the public at our centre at Wat Tyler Country Park every Saturday, Sunday and bank holiday 11am-4pm, check. We are also normally open on Wednesdays 10am-4pm.

Geology Site Account

A-Z Geological Site Index

Hatfield Forest erratic boulders , HATFIELD FOREST, Uttlesford District, TL54031980, Potential Local Geological Site

show OS map  show polygon    

Site category: Boulders - puddingstone

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.



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

upload a new image

Reference: Lucy 2003a

Geology Site Map
A-Z Geological Site Index