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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.

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Roydon Ferricrete, ROYDON, Epping Forest District, TL40851021, General geological site

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Site category: Boulders - ferricrete

Site name: Roydon Ferricrete

Grid reference: TL 4085 1021

Brief description of site:

A small but conspicuous boulder of ferricrete (60cm x 60cm x 50cm in size) protrudes from the grass opposite the war memorial not far from the church (Salter 1914).

The boulder was described by Salter as a Hertfordshire Puddingstone (Salter 1914).

Good building stone is rare in Essex and East Anglia but one exception is the rock ferricrete. In Ice Age gravels the movement of iron-rich groundwater has resulted in the formation of hard, solid masses of ferricrete which is an ‘iron pan’ at the level of the water table. It is basically an iron-cemented gravel but it can be extremely hard and durable. Ferricrete has been used in the construction of several Essex churches.

 

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Reference: Salter 1914, Lucy 2003a

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