Mazon Creek Pectinoid Scallop Fossils

Name: Aviculopecten mazonensis Scallop Fossils

Phylum Mollusca; Class Bivalvia; Pectinoida, Aviculopectinidae

Geological Time: Pennsylvanian (~300 m.y.a.)

Size: 18 mm long by 12 mm wide and 21 mm long by 16 mm wide in a 36 mm by 40 mm nodule

Fossil Site: Mazon Creek, Pit 11, Francis Creek shale, Braidwood, Illinois

The pectinoids are commonly referred to as scallops. This specimen contains a pair of these bivalve fossils in the same nodule, a most unusual occurrence.

click fossil pictures to enlarge

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