fossil

Fossilized Shell Fragment

Bivalvia or Gastropoda (Class) fragment

Hardness: 3-3.5 (Mohs scale), Color: Multi-colored with grey, white, and brownish mineral staining, Luster: Dull/Earthy to slightly pearly where original shell remains, Structure: Curved biometric shape with layered mineralization

Hardness: 3-3

Identified July 17, 2026More fossil →

Explore Fossilized Shell Fragment in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Forms through the process of permineralization or recrystallization of marine organism remains within sedimentary layers over millions of years, often in coastal or former seabed environments.

Uses & applications

Educational specimens, hobbyist collecting, and scientific study of prehistoric marine life and paleoenvironments.

Geological facts

Shell fossils are some of the most common fossils found worldwide. This specific piece shows significant weathering and mineral replacement, likely by calcite or silica.

Field identification & locations

Identify by looking for distinct curved shapes, growth lines, or symmetry unusual for standard rocks. Often found along shorelines, riverbeds, and in limestone outcrops.

Other fossil specimens

See all

Crinoid Stem Fossil in Matrix

Phylum Echinodermata, Class Crinoidea

fossil

Sedimentary Outcrop (Sandstone/Shale)

Sedimentary bedrock formation (variable composition)

sedimentary

Fossiliferous Limestone

Fossiliferous Calcilutite / Biomicrite

sedimentary

Fossilized Crinoid Stem in Limestone

Crinoidea (Class) in Calcium Carbonate (CaCO3) matrix

fossil

Fossiliferous Limestone

Limestone with embedded fossil cross-section

sedimentary

Fossiliferous Limestone

Biogenic Limestone with Brachiopod/Crinoid fragments

sedimentary