fossil

Fossil brachiopod shell

Brachiopoda indeterminate; possibly a strophomenid or spiriferid

AI-generated identification · may be incorrect

A ribbed, bilaterally patterned shell fossil with a gray-brown weathered surface and likely calcite composition; brachiopod shells are typically Mohs 3–4, nonmetallic, and may preserve radial ribs and a beak. Exact identification is limited by the single, somewhat blurred view.

Identified August 13, 2026More fossil →

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Physical properties

Formation & geological history

Brachiopods are marine invertebrates that lived from the Cambrian to the present, with peak diversity in the Paleozoic. This specimen likely formed when a calcitic shell was rapidly buried in marine sediment and later lithified and exposed by erosion.

Uses & applications

Primarily used for collecting, education, and paleontological study; it has little industrial or jewelry value. Fossil shells may be cut or polished decoratively.

Geological facts

Brachiopods resemble clams but have shells divided dorsally and ventrally rather than left and right. Radial ribs and unequal valves are useful diagnostic features.

Field identification & locations

Look for a central symmetry plane, radial ribbing, a pointed hinge/beak, and two unequal valves; common fossil-bearing limestones and shales worldwide yield them. Avoid acid testing if preservation is important, since calcite dissolves in acid.