fossil

Fossil brachiopod shell

Likely a spiriferid or orthid brachiopod; shell composed mainly of calcium carbonate (calcite)

AI-generated identification · may be incorrect

Ribbed, fan-shaped, bilaterally symmetrical fossil shell with strong radial ornamentation; typically Mohs 3, dull to pearly luster, and calcite cleavage may be visible. The specimen appears mineralized and weathered brown.

Identified August 20, 2026More fossil →

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Physical properties

Formation & geological history

A marine brachiopod lived on Paleozoic seafloors, commonly during the Devonian–Permian (about 419–252 million years ago); burial and lithification preserved the shell in sedimentary rock.

Uses & applications

Primarily a teaching, display, and fossil-collecting specimen; it has no significant industrial or jewelry use.

Geological facts

Brachiopods resemble clams but differ in symmetry: each shell valve is usually symmetrical from side to side, unlike bivalves. Radial ribs strengthened the shell and aided stability on the seafloor.

Field identification & locations

Identify it by the fan-like outline, pronounced ribs, and apparent symmetry; common sources include Paleozoic marine limestones in North America, Europe, and Asia. Value is typically $5–$30 for a small common specimen, or $50–$200+ if unusually complete, prepared, or from a notable locality.