Rock Identifier
Brachiopod Fossil (Phylum Brachiopoda) — fossil
fossil

Brachiopod Fossil

Phylum Brachiopoda

AI-generated identification · may be incorrect

Hardness varies by host rock, typically Mohs 3-5; color ranges from tan to dark brown or black; dull to earthy luster; preserved in sedimentary matrix.

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Physical properties

Hardness varies by host rock, typically Mohs 3-5; color ranges from tan to dark brown or black; dull to earthy luster; preserved in sedimentary matrix.

Formation & geological history

Formed during the Paleozoic era when marine organisms were buried in sediment and their shells were replaced by minerals over millions of years.

Uses & applications

Valued by fossil collectors, educational purposes, and used in biostratigraphy to date rock layers.

Geological facts

Brachiopods resemble clams externally but belong to a completely different phylum with a muscular pedicle for attachment.

Field identification & locations

Identified by symmetrical shell valves and fan-like radiating ribs; commonly found in limestone and shale formations worldwide.

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