fossil

Fossil Seashell

Invertebrate fossil (Bivalvia)

Hardness typically around 3.5 to 4 on the Mohs scale depending on mineralization, color ranges from white to grey or tan, dull to earthy luster, composed mainly of calcium carbonate or replaced by silica.

Identified July 31, 2026More fossil →

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Physical properties

Formation & geological history

Formed through the process of fossilization where the original shell material of a marine mollusk is preserved, mineralized, or replaced by surrounding sediments over thousands to millions of years in marine sedimentary environments.

Uses & applications

Used in educational exhibits, fossil collecting, decorative items, and jewelry.

Geological facts

Fossilized shells provide crucial evidence of ancient marine ecosystems and past climates, with some fossil beds dating back hundreds of millions of years to the Paleozoic and Mesozoic eras.

Field identification & locations

Found in sedimentary rock formations worldwide, particularly in limestone, shale, and sandstone deposits. Look for distinct exterior ribs, growth lines, and symmetry characteristic of bivalve mollusks.