fossil

Fossil-bearing limestone, possibly with crinoid stem sections

Calcite-rich fossiliferous limestone (CaCO₃); the circular features may be fossil fragments

AI-generated identification · may be incorrect

Tan to ochre, dull and rough, with pale circular structures in a fine-grained matrix. Calcite is Mohs 3 and reacts with dilute acid; the photo alone cannot establish the rock’s hardness or crystal texture.

Identified October 8, 2026More fossil →

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At a glance

Common name: Fossil-bearing limestone, possibly with crinoid stem sections
Scientific name: Calcite-rich fossiliferous limestone (CaCO₃); the circular features may be fossil fragments
Category: fossil
Identified: October 8, 2026
Method: Standard

AI Estimated Value

Approximately $1–$20 for a small, common fragment; clearly identifiable or unusually well-preserved 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

Limestone forms as carbonate sediment accumulates and lithifies, often preserving marine organisms. The specimen’s age and exact depositional setting cannot be determined from the image.

Uses & applications

Primarily a collecting specimen; limestone is widely used for aggregate, cement, and building stone, while identifiable fossils may be displayed or studied.

Geological facts

The ring-like markings resemble cross-sections of fossil stems or other marine remains, but their identity is uncertain without closer inspection.

Field identification & locations

Look for repeated, consistent fossil patterns and test a hidden spot with dilute acid for fizzing; avoid damaging it if fossil value matters. Fossiliferous limestone occurs in sedimentary formations worldwide.