fossil

Brachiopod Fossil in Matrix

Phylum Brachiopoda

Hardness varies by mineral replacement (typically Mohs 3-4 for calcite shells); color ranges from gray, brown, to beige; dull to earthy luster; preserved in sedimentary limestone, shale, or siltstone matrix.

Identified July 31, 2026More fossil →

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Physical properties

Formation & geological history

Formed through the fossilization of marine invertebrate animals (brachiopods) that lived in shallow ancient seas, typically during the Paleozoic era (such as the Ordovician, Devonian, or Carboniferous periods), where their shells were buried in sediment and mineralized over millions of years.

Uses & applications

Used in paleontological research, educational displays, stratigraphy dating, and as collector specimens.

Geological facts

Brachiopods superficially resemble clams (bivalves), but they belong to a completely different phylum with a unique internal anatomy and a lophophore for feeding. They were among the most abundant life forms in Paleozoic oceans.

Field identification & locations

Found worldwide in sedimentary rock outcrops, particularly in road cuts, quarries, and stream beds containing marine shales and limestones from the Paleozoic era.