sedimentary

Fossiliferous limestone (likely coral or shell-rich limestone)

Calcite-dominated limestone, chiefly calcium carbonate (CaCO₃); exact fossil type is unclear from the image

AI-generated identification · may be incorrect

Tan to gray-brown, rough and highly porous, with numerous rounded cavities and possible fossil fragments; likely Mohs hardness 3, dull to slightly vitreous calcite surfaces, with no visible crystal framework. Limestone commonly fizzes in dilute acid, though weathering or coatings can obscure the reaction.

Identified October 5, 2026More sedimentary →

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At a glance

Common name: Fossiliferous limestone (likely coral or shell-rich limestone)
Scientific name: Calcite-dominated limestone, chiefly calcium carbonate (CaCO₃); exact fossil type is unclear from the image
Category: sedimentary
Identified: October 5, 2026
Method: Standard

AI Estimated Value

Approximately $5–$50 for a common loose specimen; larger, well-preserved or identifiable fossils 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

Formed as carbonate sediment and reef or shell material accumulated in shallow marine water, then compacted and cemented; age cannot be determined from the photograph.

Uses & applications

Fossiliferous limestone is used as building and decorative stone, cement and lime feedstock, and as a collecting specimen.

Geological facts

The holes may be fossil molds or cavities left by dissolved shells or coral; the image alone cannot establish a specific fossil or reef origin.

Field identification & locations

Look for identifiable shell, coral, or other fossil structures and test a fresh spot for acid fizz; similar limestone occurs in marine sedimentary formations worldwide.