sedimentary

Fossiliferous limestone pebble

Bioclastic limestone, likely containing small gastropod or bivalve fossils (primarily calcite, CaCO₃)

AI-generated identification · may be incorrect

Smooth, rounded brown-gray pebble with pale fossil fragments or molds; typically Mohs hardness 3, dull to weakly earthy luster, fine-grained carbonate texture, and no obvious cleavage. It should fizz weakly to strongly with dilute hydrochloric acid or vinegar if calcitic.

Identified September 4, 2026More sedimentary →

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At a glance

Common name: Fossiliferous limestone pebble
Scientific name: Bioclastic limestone, likely containing small gastropod or bivalve fossils (primarily calcite, CaCO₃)
Category: sedimentary
Identified: September 4, 2026
Method: Standard

AI Estimated Value

Usually $1-$10 as a common beach pebble; roughly $10-$40 if fossils are unusually clear, abundant, or from a documented locality.

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

Forms from accumulated shells and skeletal debris deposited in shallow marine environments, later compacted and cemented into limestone; the specimen was rounded by wave or stream transport. Its exact geological age cannot be determined from the photograph.

Uses & applications

Used as aggregate, building stone, cement feedstock, and decorative material; attractive fossiliferous pieces are collected but are generally not jewelry-grade.

Geological facts

The white circular markings may be cross-sections or molds of tiny marine organisms, though surface abrasion obscures their details. Acid reaction and closer inspection of the fossil shapes would improve identification.

Field identification & locations

Common in beaches, stream gravels, and limestone regions worldwide. Identify by its carbonate reaction, relatively soft surface, and embedded fossil patterns; avoid strong acid if preservation matters.