One of the mysteries of the English language finally explained.
In plural and singular A band of clays and shales of the Wealden series (Lower Cretaceous) extending through Kent and East Sussex.
Late 19th century; earliest use found in Proceedings of the Geologists' Association. From Fairlight, the name of a village in East Sussex, in the proximity of cliffs which were important in the identification of this band of clays and shales + clay.
Fairlight clay/ˌfɛːlʌɪt ˈkleɪ/
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