sedimentary

Weathered fossil-bearing limestone, possibly coral or shell limestone

Calcite-rich limestone (CaCO₃); fossil identity is uncertain from the photograph

AI-generated identification · may be incorrect

Usually Mohs hardness 3, dull to earthy luster, gray-tan color, and massive microcrystalline structure with poor or absent cleavage. It should fizz vigorously with dilute hydrochloric acid; visible cracks and possible fossil textures are consistent with weathered limestone.

Identified September 6, 2026More sedimentary →

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At a glance

Common name: Weathered fossil-bearing limestone, possibly coral or shell limestone
Scientific name: Calcite-rich limestone (CaCO₃); fossil identity is uncertain from the photograph
Category: sedimentary
Identified: September 6, 2026
Method: Standard

AI Estimated Value

About $5–$25 for a common hand specimen; $25–$150+ if diagnostic fossils are exposed and legally collected.

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

Formed from compacted marine carbonate mud and skeletal debris, commonly during Paleozoic–Mesozoic marine deposition, then lithified and weathered at the surface. Exact age requires fossil or laboratory identification.

Uses & applications

Used for aggregate, cement, lime, building stone, and soil conditioning; fossiliferous pieces are collected as teaching or display specimens. Commercial value is generally low unless fossils are exceptionally clear or scientifically important.

Geological facts

The irregular cavities and layered-looking surfaces may represent dissolved shells, coral, or other bioclasts, but the image is insufficient for a precise fossil designation.

Field identification & locations

Common in marine sedimentary terrains worldwide, including the United States, Europe, and Australia. Check for acid reaction, powdery calcite streak, and recognizable fossil chambers; avoid confusing it with dolostone, which reacts weakly when powdered.