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Peridroma saucia
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Essex Field Club
Essex Field Club
registered charity
no 1113963
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We are normally open to the public at our centre at Wat Tyler Country Park every Saturday, Sunday and bank holiday 11am-4pm. We are also open on Wednesdays 10am-4pm.
Early Summer recording Record Red-and-Black Froghopper Record Lavender Beetle
Record Stag Beetle
Record Misumena crab spider
Record Lily Beetle
Record Swollen-thighed Beetle Record Zebra Spider

Geology Site Account

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

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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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