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Period: Late Frasnian (F 3), Late Devonian Find Spot: Barvaux sur Ourthe, Belgium Size: 76 x 46 mm Age: approx. 376mya
Rare Late Devonian serpulidae of the kind Spirorbis sp. (DAUDIN, 1880) on big Cyrtospirifer grabaui (PAEKELMANN, 1942).