fossil

Fossiliferous Limestone with Brachiopod

Phylum Brachiopoda in Sedimentary Matrix (CaCO3)

Hardness: 3-4 (matrix); Color: Tan, brown, and grey; Luster: Dull/Earthy; Structure: Biogenic sedimentary texture with visible skeletal remains; Specific Gravity: ~2.7

Hardness: 3-4 (matrix)
Color: Tan, brown, and grey
Luster: Dull/Earthy

Identified July 1, 2026More fossil →

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Physical properties

Hardness: 3-4 (matrix); Color: Tan, brown, and grey; Luster: Dull/Earthy; Structure: Biogenic sedimentary texture with visible skeletal remains; Specific Gravity: ~2.7

Formation & geological history

Formed in a shallow marine environment where shells and skeletal remains accumulated under high pressure over millions of years, typically Paleozoic to Mesozoic era.

Uses & applications

Paleontological study, educational collecting, and sometimes architectural stone if high quality.

Geological facts

Brachiopods are often called 'lamp shells' due to their resemblance to ancient oil lamps. They were one of the most abundant life forms in the Paleozoic oceans.

Field identification & locations

Identified by the distinct hinge line or symmetrical valve protruding from the rough stone matrix. Commonly found in limestone outcrops and riverbeds.

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