fossil

Probable fossiliferous limestone with shell or coral fossils

Fossiliferous limestone, chiefly calcite (CaCO₃); exact fossil type is unclear from the image

AI-generated identification · may be incorrect

Tan-gray, rough, lumpy specimen with embedded rounded fossil-like forms. Limestone is typically Mohs 3, calcite-rich, and reacts with dilute acid; crystal structure is trigonal, though individual grains may be too fine to see.

Identified October 5, 2026More fossil →

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At a glance

Common name: Probable fossiliferous limestone with shell or coral fossils
Scientific name: Fossiliferous limestone, chiefly calcite (CaCO₃); exact fossil type is unclear from the image
Category: fossil
Identified: October 5, 2026
Method: Standard

AI Estimated Value

Approximately $5–$50 for a common, unidentified specimen; verified, well-preserved fossils can 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

Likely formed as carbonate sediment accumulated in a marine environment and lithified, preserving shells or coral. Its geological age cannot be determined from the image alone.

Uses & applications

Collected for paleontology and display; fossiliferous limestone is also used as building stone and cement or lime feedstock.

Geological facts

Many fossiliferous limestones preserve reef organisms, shell fragments, or other marine life, but this specimen’s features are not diagnostic enough to identify a specific fossil.

Field identification & locations

Look for repeated shell patterns or identifiable skeletal structures and test a small inconspicuous area for calcite fizz with dilute acid. Similar material occurs in sedimentary marine formations worldwide; professional examination may be needed for identification.