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Dictyna latens
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Essex Field Club
Essex Field Club
registered charity
no 1113963
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EFC Centre at Wat Tyler Country ParkWe are open today

We are normally open to the public on Saturdays, Sundays and bank holidays 11am-4pm, check. We are also open on Wednesdays 10am-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

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

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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


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

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