sedimentary

Fossiliferous limestone (likely containing shell fossils)

Calcite-rich limestone, chiefly CaCO₃; visible fossils are uncertain from the image

AI-generated identification · may be incorrect

Cream, tan, and gray with rounded fossil-like patterns and a dull to slightly waxy surface. Limestone is typically Mohs 3, with calcite crystals and weak or absent cleavage in the whole rock; it may fizz in dilute acid.

Identified October 3, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms from accumulated carbonate mud and shell material in marine settings, then lithifies. The specimen’s age cannot be determined from the image alone.

Uses & applications

Used as building and landscaping stone, aggregate, and a source of lime and cement; fossiliferous pieces are also collected or displayed.

Geological facts

Circular markings may be fossil cross-sections, but similar patterns can result from mineral structures or weathering; identification needs close inspection.

Field identification & locations

Look for preserved shell walls or repeated biological shapes and test a discreet spot with dilute acid for calcite fizz. Fossil-bearing limestones occur worldwide, especially in former marine basins.