fossil

Fossil-bearing sedimentary rock, likely with a fossil shell or ammonite cross-section

Fossiliferous limestone or calcareous mudstone; fossil identity is uncertain from the image

AI-generated identification · may be incorrect

Tan, fine-grained matrix with a circular fossil-like feature and darker mineralized material. Hardness and luster cannot be reliably determined from the photo; fossils are commonly preserved in calcite-rich sedimentary rock.

Identified October 14, 2026More fossil →

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At a glance

Common name: Fossil-bearing sedimentary rock, likely with a fossil shell or ammonite cross-section
Scientific name: Fossiliferous limestone or calcareous mudstone; fossil identity is uncertain from the image
Category: fossil
Identified: October 14, 2026
Method: Standard

AI Estimated Value

Approximately $5–$50 for a small, common, unidentified specimen; confirmed, 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

Shell or other fossil material was buried in sediment and mineralized as the sediment lithified, potentially during the Paleozoic or Mesozoic; the image does not allow age determination.

Uses & applications

Primarily collected or used for education and display; fossiliferous limestone can also be used as dimension stone or aggregate.

Geological facts

The circular outline and internal markings may represent a fossil in cross-section, but a concretion or other sedimentary structure is also possible.

Field identification & locations

Look for repeated shell-like chambers, symmetry, and a boundary distinct from the surrounding rock; a fossil specialist or close-up examination can confirm identification. Fossil-bearing sedimentary rocks occur worldwide.