fossil

Fossilized Tabulate Coral

Favosites (Honeycomb Coral)

Hardness: 3-4 (calcite-based), Color: Tan, beige, or brown with white skeletal structures, Luster: Dull to earthy, Structure: Hexagonal or polygonal tube-like structures (corallites) resembling a honeycomb

Identified July 3, 2026More fossil →

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Physical properties

Formation & geological history

Formed in shallow marine environments during the Silurian to Devonian periods (approx. 430-360 million years ago) through the permineralization of coral skeletons with calcium carbonate or silica.

Uses & applications

Primarily used as educational specimens, decorative items, and for scientific study in paleontology to understand ancient marine ecosystems.

Geological facts

Members of the Favositids are known as 'honeycomb corals' because of their geometric appearance. They were widespread and significant reef-builders before their extinction in the Permian mass extinction.

Field identification & locations

Identify by the distinct, repeating polygonal pattern on the surface. Commonly found in sedimentary limestone outcrops throughout the Midwest United States, Canada, and parts of Europe.