Petworth marble

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Pet´worth mar´ble

1.A kind of shell marble occurring in the Wealden clay at Petworth, in Sussex, England; - called also Sussex marble.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
(52) If we can trust surviving descriptions, the tomb was carved from "Petworth Marble," a stone that geologists call "large 'Paludina' marble," after the fossil shells embedded in its calcite matrix.
For the shells' resemblance to the modern "periwinkle," Petworth marble and the related Purbeck stone are sometimes colloquially called "winklestone."