sedimentary

Fossiliferous limestone pebble (possible shell fossil)

Calcite-rich limestone, chiefly CaCO₃; fossil identity is unclear from the image

AI-generated identification · may be incorrect

Pale gray-white, matte to slightly waxy surface with irregular grooves and pits; likely calcite hardness ~3 Mohs, but the specimen’s texture and composition cannot be confirmed visually.

Identified October 3, 2026More sedimentary →

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Physical properties

Pale gray-white, matte to slightly waxy surface with irregular grooves and pits; likely calcite hardness ~3 Mohs, but the specimen’s texture and composition cannot be confirmed visually.

Formation & geological history

Limestone forms through accumulation and lithification of carbonate mud and marine shell material. Its age and precise depositional setting cannot be determined from the photograph.

Uses & applications

Commonly used as aggregate, building stone, and cement feedstock; this small pebble is mainly suitable for display or collecting.

Geological facts

The grooves and cavities may be fossil or shell impressions, but could also be natural weathering or abrasion features.

Field identification & locations

Look for identifiable shell structure and a calcite reaction to dilute acid; limestone commonly occurs in marine sedimentary formations worldwide. Avoid acid testing if preservation or display matters.