Rock Identifier
Fossilized Brachiopod in Limestone (Phylum Brachiopoda embedded in sedimentary limestone) — fossil
fossil

Fossilized Brachiopod in Limestone

Phylum Brachiopoda embedded in sedimentary limestone

Hardness: 3 on the Mohs scale (for the limestone matrix); Color: Grey to tan-brown; Luster: Dull to earthy; Crystal structure: Microcrystalline calcite matrix with fossilized shell impressions displaying radial symmetry and ribs.

Hardness
3 on the Mohs scale (for the limestone matrix)
Color
Grey to tan-brown
Luster
Dull to earthy
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Physical properties

Hardness: 3 on the Mohs scale (for the limestone matrix); Color: Grey to tan-brown; Luster: Dull to earthy; Crystal structure: Microcrystalline calcite matrix with fossilized shell impressions displaying radial symmetry and ribs.

Formation & geological history

Formed in ancient shallow marine environments during the Paleozoic era (such as the Ordovician to Devonian periods, roughly 300 to 500 million years ago) where shelled organisms accumulated in carbonate-rich sediments and underwent fossilization.

Uses & applications

Educational purposes, fossil collecting, paleontology study, and decorative display pieces.

Geological facts

Brachiopods are among the most common fossils found in Paleozoic rocks. Although they resemble clams, they belong to a completely different phylum with a unique internal feeding structure called a lophophore.

Field identification & locations

Look for symmetrical, bivalve-like shells embedded in sedimentary rocks, often showing distinct radial ribs or a beak-like hinge. Commonly found in roadcuts, riverbeds, and quarries containing ancient limestone.

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