fossil

Fossilized Coral / Fossiliferous Limestone

Anthozoa fossil in Limestone (CaCO3)

Mohs hardness around 3-4; dull to earthy luster; dark gray, brownish-gray, or tan color; features distinct porous/cellular coral texture or embedded shell impressions; reacts with dilute hydrochloric acid.

Identified July 23, 2026More fossil →

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Physical properties

Formation & geological history

Formed in shallow, warm marine environments where ancient reef-building organisms (such as rugose or tabulate corals) died and were buried under marine sediments, eventually permineralizing over millions of years (often Paleozoic to Mesozoic eras).

Uses & applications

Used primarily as decorative specimens, geological educational samples, landscaping stone, and for fossil collecting.

Geological facts

Fossilized corals are often millions of years old, dating back to periods such as the Silurian or Devonian when ancient oceans covered large parts of modern continents. The porous, sponge-like or honeycomb pattern visible in the specimen is characteristic of cross-sections of coral corallites.

Field identification & locations

Look for honeycomb-like pore patterns, radial structures, or small shell fragments embedded within a fine-grained limestone matrix. Common in stream beds, quarries, and coastal regions with limestone bedrock.

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Fossilized Crinoid Stem in Limestone

Crinoidea (Class) in Calcium Carbonate (CaCO3) matrix

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