sedimentary

Fossiliferous limestone pebble

Bioclastic limestone, primarily calcite (CaCO₃)

AI-generated identification · may be incorrect

Tan, fine-grained matrix with visible shell or fossil fragments; typically dull to slightly earthy luster, Mohs hardness 3, and poor crystalline visibility. Calcite-rich limestone fizzes readily with dilute hydrochloric acid or strong vinegar, though weathering may reduce the reaction.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from accumulated and cemented marine skeletal debris, likely deposited in a shallow tropical sea during the Paleozoic–Cenozoic (exact age requires fossil identification). Later erosion rounded it into a pebble.

Uses & applications

Used as aggregate, cement and lime feedstock, building stone, and ornamental material; this small specimen has mainly educational or collecting value.

Geological facts

The pale inclusions may be shell fragments, but a clear identification requires magnification and possibly thin-section study. Fossiliferous limestone can preserve brachiopods, bivalves, crinoids, or other marine organisms.

Field identification & locations

Common in sedimentary terrains, river gravels, beaches, and limestone quarries worldwide. Look for bedding, fossil outlines, earthy texture, and acid effervescence; avoid confusing it with fossil-bearing concrete.