IRONSTONE CONCRETION - Suffolk

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IRONSTONE CONCRETION

Norwich Crag Formation

Covehithe, near Southwold, Suffolk

In unconsolidated sedimentary rocks iron is often dissolved in the groundwater and can be redeposited as hard, insoluble layers of iron oxide. Round or odd-shaped concretions are sometimes formed, consisting of concentric layers of iron minerals such as limonite and goethite.

In this case the concretion consists of a hard limonite 'shell' with a core of clay. It appears that the iron compounds slowly migrated outwards through the clay from a central point, until crystallising as a limonite layer.

A curious item. One for the collector of unusual works of nature!

Click on a picture for a larger image

Size: 9.5 x 8 x 5 centimetres
Weight: 435 grams

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