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Essex Field Club
Essex Field Club
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Essex Field Club

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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

Alphamstone Gravel Pits, ALPHAMSTONE , Braintree District, TL872355, General geological site

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Site category: Thames (pre-diversion)

Site name: Alphamstone Gravel Pits

Grid reference: TL 872 355

Brief description of site:

Disused pits west of the village formerly showed 6 metres of Thames gravel (Bures Gravel) and 6 metres of chalky boulder clay. The gravel has an abundance of far-travelled exotic pebbles.



These pits are important because it was here that identification of pebbles possibly originating in North Wales helped geologists piece together the evidence that the Kesgrave Sands and Gravels was laid down by the River Thames and that this river at that time had its headwaters in Snowdonia. The gravel also has an abundance of quartzite (‘bunter’) cobbles from the West Midlands.

In 1975 a fine section of Kesgrave Gravel with overlying boulder clay (with a sharp planar base) was seen at TL 8700 3588.


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Reference: Whiteman 1992 (page 46); Hey & Brenchley 1977 (page 221); Rose & Turner 1973

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