What does the cryptic crossword clue "Of a type of rock since found in the sea (8)" mean?

This cryptic clue uses wordplay to arrive at the answer. Visit the page for progressive hints — definition, wordplay type, and a full step-by-step explanation.

Of a type of rock since found in the sea (8)

Guardian Cryptic #23308 | 15 Down | 2004-11-24

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