Rock Identifier
Fossil gastropod shell (Fossilized marine gastropod; exact genus/species cannot be determined from the image) — fossil
fossil

Fossil gastropod shell

Fossilized marine gastropod; exact genus/species cannot be determined from the image

AI-generated identification · may be incorrect

Spiral, coiled shell with a low, pointed spire and visible aperture; likely calcite or aragonite replaced or preserved as calcium carbonate. Mohs hardness about 3, typically dull to pearly, with internal chambering and possible sediment infill.

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Physical properties

Spiral, coiled shell with a low, pointed spire and visible aperture; likely calcite or aragonite replaced or preserved as calcium carbonate. Mohs hardness about 3, typically dull to pearly, with internal chambering and possible sediment infill.

Formation & geological history

Formed by a marine snail and buried in sediment; mineralization or recrystallization preserved the shell, commonly in Paleozoic–Cenozoic limestone or sandstone. Exact age requires locality and matrix analysis.

Uses & applications

Used mainly for education, fossil collecting, décor, and scientific study; not generally valuable as jewelry or construction material.

Geological facts

The spiral growth pattern records the animal’s shell development. Fossil shells may retain original layering, but many have been partly replaced by calcite, silica, or iron minerals.

Field identification & locations

Identify by the continuous logarithmic spiral, shell whorls, and aperture; distinguish it from a modern shell by mineral infill, rock-like weight, and lack of organic luster. Common in marine sedimentary rocks worldwide.

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Fossiliferous limestone (likely a crinoidal or shell-fragment limestone)

Bioclastic limestone, composed chiefly of calcite (CaCO₃)

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Calcite-rich limestone (primarily CaCO₃); exact identification is uncertain from the image

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Weathered fossil bone fragment (identification uncertain)

Fossilized bone; exact taxon and mineral composition cannot be determined from the image

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