sedimentary

Weathered fossiliferous limestone

Calcitic limestone, predominantly calcium carbonate (CaCO₃), possibly containing shell or coral fossil fragments

AI-generated identification · may be incorrect

Usually Mohs 3–4; cream to tan-gray, dull to slightly earthy luster, fine- to coarse-grained, and commonly shows porous or fossil-textured surfaces. It fizzes with dilute hydrochloric acid or vinegar if calcite-rich; the image alone cannot confirm the exact fossil type.

Identified August 11, 2026More sedimentary →

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At a glance

Common name: Weathered fossiliferous limestone
Scientific name: Calcitic limestone, predominantly calcium carbonate (CaCO₃), possibly containing shell or coral fossil fragments
Category: sedimentary
Identified: August 11, 2026
Method: Standard

AI Estimated Value

About $5–$25 for a common hand specimen; $30–$150 or more if a clearly identifiable, attractive fossil is present.

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 accumulated marine shells, skeletal debris, or carbonate mud that lithified during burial, commonly in Paleozoic–Cenozoic shallow-marine settings. Weathering has accentuated the darker fossil or matrix patterns.

Uses & applications

Used for aggregate, cement, lime, building stone, and educational or decorative specimens; fossiliferous pieces are mainly collected rather than used as gemstones.

Geological facts

The dark branching or mottled markings may represent fossil fragments, stylolites, iron/manganese staining, or weathered inclusions. A definitive identification requires a closer view, acid testing, and often a fresh broken surface.

Field identification & locations

Common worldwide in former shallow seas, including the United States, Europe, and parts of Asia. Look for visible fossil structures, calcite reaction, relatively low hardness, and powdery white streak; avoid damaging potentially significant fossils.