Polished Orthoceras fossil (extinct nautiloid) in black limestone matrix, dating to the Devonian Period, around 400 million years ago. Its distinctive elongated shell structure is sharply visible, revealing the segmented chambers of this ancient sea creature. Details: Species: Orthoceras Period: Devonian (~400 million years ago) Origin: Morocco Material: Black fossil limestone Size: approx. 12 × 6 cm Condition: Excellent – polished surface enhances fossil detail A striking black-and-white contrast fossil, ideal for collectors or as a decorative natural history display.