sedimentary

Fossiliferous limestone

Bioclastic limestone, likely containing fossil corals or other marine invertebrates; exact fossils cannot be confirmed from the image

AI-generated identification · may be incorrect

Gray, fine- to medium-grained carbonate rock with pale circular fossil patterns and a dull to slightly crystalline luster. Calcite is Mohs 3 and commonly fizzes in dilute acid; limestone has no single crystal structure.

Identified October 7, 2026More sedimentary →

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At a glance

Common name: Fossiliferous limestone
Scientific name: Bioclastic limestone, likely containing fossil corals or other marine invertebrates; exact fossils cannot be confirmed from the image
Category: sedimentary
Identified: October 7, 2026
Method: Standard

AI Estimated Value

Common field rock: little to no collector value; small permitted fossiliferous specimens typically sell for about $5–$50, depending on fossil quality and 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

Formed from marine carbonate mud and skeletal remains, later compacted and cemented. Its age and precise depositional environment cannot be determined from the photograph; such limestone forms in shallow, warm seas.

Uses & applications

Limestone is used for cement and lime, aggregate, building stone, and agricultural soil treatment. Fossil-rich outcrops are primarily of scientific and educational interest.

Geological facts

The circular markings may be fossil cross-sections, but image details are insufficient to identify them reliably. Fossils can reveal the organisms and environments present when the sediment accumulated.

Field identification & locations

Look for calcite-rich rock with visible fossil patterns and test a fresh surface for fizzing with dilute acid. Limestone occurs worldwide in sedimentary basins; avoid removing material from protected sites.