Abstract
Unusual conjunctions of geological phenomena in the modern environment may alert us to their potential presence in the rock record. Two erratics of Carboniferous limestone from the beach at Cleveleys on the Irish Sea coast, Lancashire, northern England bored by sponges and polychaete worms, are suggestive of potential occurrences of borings in ancient conglomerates. Such distinctive patterns of boring, commoner in crystalline veins than in limestone, are certainly unfamiliar. But borers are well‐known for invading crystalline organic substrates, such as belemnites and oysters.
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