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