Iron ore in the form of siderite, commonly known as iron stone or historically as mine, occurs in patches or bands in the Cretaceous clays of the Weald.
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The family became wealthy through their land holdings in Sussex and around Pembrey in Carmarthenshire, and later from their participation in the Wealden iron industry.
The River Ashbourne flows into the Haven, down which iron products, particularly cannon, used to be shipped from the Wealden iron works at Ashburnham.
Cloth-making was, apart from iron-making, the other large-scale industry carried out on the Weald of Kent and Sussex in medieval times.