fossil

Fossil-bearing limestone pebble

Fossiliferous limestone, chiefly calcite (CaCO₃); the visible fossil cannot be identified confidently from the image

AI-generated identification · may be incorrect

Pale gray-white, dull to slightly crystalline, with irregular fossil-like markings and weathered surfaces. Calcite has Mohs hardness 3 and rhombohedral cleavage; the pebble’s hardness may vary with impurities.

Identified October 3, 2026More fossil →

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At a glance

Common name: Fossil-bearing limestone pebble
Scientific name: Fossiliferous limestone, chiefly calcite (CaCO₃); the visible fossil cannot be identified confidently from the image
Category: fossil
Identified: October 3, 2026
Method: Standard

AI Estimated Value

About $1–$10 for an ordinary loose pebble; a clearly identifiable fossil or attractive specimen may be worth more.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Limestone forms from accumulated carbonate mud and marine shells, later compacted and cemented; the pebble was rounded by erosion. Its age and exact depositional setting cannot be determined from the photograph.

Uses & applications

Common limestone is used in cement, aggregate, and building stone; fossiliferous pieces are mainly collected or displayed.

Geological facts

Limestone often preserves marine fossils, but surface patterns can also result from fractures or weathering.

Field identification & locations

Look for recognizable shell, coral, or other repeated biological structure within a calcite-rich rock; a drop of dilute acid fizzes on limestone. Fossiliferous limestone occurs worldwide, especially in former marine sedimentary basins.