fossil

Fossiliferous limestone pebble

Calcitic limestone, primarily CaCO₃ (calcite), containing a possible trace-fossil or shell fragment

AI-generated identification · may be incorrect

Fine-grained, rounded, gray-brown stone with a dull to weakly waxy luster and pale cream fossil-like markings; calcite hardness is 3, with good reaction to dilute hydrochloric acid or vinegar. The apparent fossil pattern may be a shell, burrow, or mineral vein, but cannot be confirmed from one photograph.

Identified August 31, 2026More fossil →

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Physical properties

Formation & geological history

Likely formed as marine carbonate sediment lithified into limestone, with later erosion producing the smooth pebble; age could range from Paleozoic to Cenozoic depending on locality. The pale markings may represent fossil material or calcite-filled fractures.

Uses & applications

Used chiefly as a decorative or educational specimen; limestone is widely used for cement, aggregate, lime, and building stone. Fossil-bearing examples have modest collecting interest.

Geological facts

Limestone commonly preserves shells, burrows, corals, and microbial structures. Calcite-rich rock typically fizzes visibly when scratched or powdered and exposed to acid.

Field identification & locations

Look for consistent fossil morphology, visible grains, and acid effervescence; avoid confusing calcite veins with fossils. Common in former shallow-marine regions and river or beach gravels.