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Colias croceus
find out more... Colias croceus Copyright: Peter Harvey

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 at every Saturday, Sunday and bank holiday 11am-4pm, check. 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

Noak Bridge road cutting, BASILDON, Basildon District, TQ69259024, General geological site

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Noak Bridge road cutting


In 1983, road improvements at the Basildon exit of the A127 (Southend Arterial Road) revealed a small expanse of weathered, chocolate brown London Clay with a layer of septarian nodules. The nodules were notable as they contained fine crystals of barite (barium sulphate) in the cavities. Barite is not uncommon in London Clay septarian nodules (see entry for Southend Cliffs in Southend-on-Sea district) but the crystals from this site were particularly lustrous and translucent.

A group of 3.5 centimetre long barite crystals from a temporary exposure of London Clay at Basildon. Photo © G. Lucy


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Reference: G.Lucy (personal communication)

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