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Acrolepiopsis assectella
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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 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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Holland-on-Sea (former exposures of London Clay), HOLLAND-ON-SEA , Tendring District, TM219171, Historical site only

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In the 1950s the cliffs Holland-on-Sea consisted of 3 to 5 metres of London Clay beneath an even thicker cover of Ice Age gravel (Holland Gravel). Good exposures of London Clay were also available on the foreshore with pieces of fossil wood, other plant remains such as fossil fruits, and small sharks’ teeth.

Much pyrite debris from the London Clay was present at the foot of the shingle which contained abundant pyritised stems of the characteristic crinoid or sea lily Balanocrinus subbasaltiformis and several internal moulds of gastropds. Two layers of septarian nodules occurred, above and below high tide mark, with their surfaces encrusted with trace fossils of worms and other animals that weather out in relief. Large burrows up to 15 centimetres long and 2 centimetres in diameter, packed with faecal pellets, were abundant and there were also spiral moulds made by unidentified marine creatures.

These remarkable trace fossils demonstrate that the mud on the London Clay sea floor some 50 million years ago was intensely burrowed (bioturbated) but the only evidence of this is found on the surfaces of the septarian concretions.


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Reference: Davis & Elliott 1951 (p.332-333), Cooper 1970.

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