fossil

Fossil scallop shell

Pectinid bivalve fossil; likely a scallop (family Pectinidae), exact genus/species uncertain

AI-generated identification · may be incorrect

A ribbed, fan-shaped bivalve shell impression or cast, gray-brown and dull to slightly pearly. Original shell is chiefly calcite (CaCO₃), Mohs hardness about 3, with radial ribs and bilateral symmetry; mineral replacement may alter these properties.

Identified September 21, 2026More fossil →

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Physical properties

Formation & geological history

Formed when a marine scallop shell was buried in sediment and preserved by mineralization, compression, or infilling. Its geological age cannot be determined from the photograph; similar fossils range from Cenozoic to modern deposits.

Uses & applications

Primarily a collectible, educational, or decorative specimen; fossil shell material is not generally used industrially or in jewelry.

Geological facts

The ribs strengthened the shell against waves and predators, while the two valves originally hinged along the straight upper edge. Fossil scallops are common indicators of former shallow-marine environments.

Field identification & locations

Identify by the fan shape, numerous radiating ribs, hinge area, and carbonate composition; vinegar or dilute acid may fizz, though testing can damage it. Common in marine sedimentary rocks and coastal fossil beds worldwide.