Essex Field Club on Facebook

Video about the Club Essex Field Club video

Ypsolopha ustella
find out more... Ypsolopha ustella 7 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

Deremy's Stone, EAST MERSEA, Colchester District, TM03691426, General geological site

show OS map    

Site category: Boulders - other types

Site name: Deremy's Stone

Grid reference: TM 0369 1426

Brief description of site:

A rounded boulder of the volcanic rock dolerite can be seen on the East Mersea Road. It has historical importance as a boundary marker and is probably a glacial erratic.



Opposite the Old Rectory, on the East Mersea Road, by the East Mersea road sign, is a rounded boulder of dolerite approximately 70 centimetres (two feet) square, known locally as Deremy's Stone. It was dug up on this spot in 1974 and provided with a plaque stating that it was originally placed here in 1046 to define the boundary of the manor of West Mersea granted by Edward the Confessor (Stainer 2001).

This boulder is probably a ‘glacial erratic’, carried south to Essex from Northern England by the Anglian Ice Sheet 450,000 years ago. Mersea Island is beyond the maximum southerly limit of the ice sheet but it is not difficult to imagine that rocks of some size would have been carried across this area by torrents of glacial meltwater.

Deremy’s Stone – a possible glacial erratic. Photo: G. Lucy


if you have an image please upload it

Reference: Stainer 2001 (p.12 & 13).

Geology Site Map
A-Z Geological Site Index