fossil

Weathered fossiliferous limestone or fossil fragment

Indeterminate bioclastic carbonate rock; likely calcite (CaCO₃) with fossil shell material

AI-generated identification · may be incorrect

Tan to brown, dull and earthy, with irregular fossil-like cavities or shell textures and darker weathering seams. Likely Mohs hardness 3–4, poor visible crystallinity, and may effervesce strongly with dilute hydrochloric acid or vinegar.

Identified August 8, 2026More fossil →

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At a glance

Common name: Weathered fossiliferous limestone or fossil fragment
Scientific name: Indeterminate bioclastic carbonate rock; likely calcite (CaCO₃) with fossil shell material
Category: fossil
Identified: August 8, 2026
Method: Standard

AI Estimated Value

$2–$15 as an unverified common specimen; roughly $20–$100 if a clearly identifiable, well-preserved fossil is confirmed.

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

Probably formed from marine skeletal debris lithified into limestone during a Paleozoic–Cenozoic marine interval, then exposed and weathered; the exact age cannot be determined from the image.

Uses & applications

Primarily a teaching or collecting specimen; limestone is widely used for cement, aggregate, lime, and dimension stone, while attractive fossil pieces may be displayed.

Geological facts

The rounded shape and worn surface suggest stream or beach transport. Apparent fossil structures could also be weathered concretions, so close inspection or acid testing is needed for confirmation.

Field identification & locations

Common in sedimentary terrains, river gravels, beaches, and limestone quarries. Look for identifiable shell symmetry, chambers, or layered biological textures; avoid acid testing if preservation is important.