Rock Identifier
Fossil Coral / Bryozoan (Anthozoa or Bryozoa indet. (Calcite/Silica)) — fossil
fossil

Fossil Coral / Bryozoan

Anthozoa or Bryozoa indet. (Calcite/Silica)

AI-generated identification · may be incorrect

Hardness 3 to 7 depending on whether calcified or silicified; tan to light brown with a branching, cylindrical habit and dull to waxy luster.

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Physical properties

Hardness 3 to 7 depending on whether calcified or silicified; tan to light brown with a branching, cylindrical habit and dull to waxy luster.

Formation & geological history

Formed through the permineralization or replacement of marine colonial organisms in ancient shallow warm-water seas, commonly Paleozoic to Cenozoic in age.

Uses & applications

Primarily collected as paleontological specimens, educational curiosities, and sometimes polished for novel jewelry.

Geological facts

Branching fossil fragments are often mistaken for modern bone, ginger roots, or concretions due to natural surface weathering.

Field identification & locations

Identifiable by its distinct Y-shaped branching morphology and typical marine sediment associations; commonly found in limestone strata and river gravels.

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Probable fossil-bearing rock or mineral concretion

Unidentified carbonate-rich concretion with a possible fossil inclusion

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Likely fossil oyster shell

Fossilized bivalve shell; exact species cannot be identified from the image

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Crinoid Stem Fossil in Matrix (Phylum Echinodermata, Class Crinoidea) — fossil

Crinoid Stem Fossil in Matrix

Phylum Echinodermata, Class Crinoidea

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Fossiliferous limestone (likely a crinoidal or shell-fragment limestone) (Bioclastic limestone, composed chiefly of calcite (CaCO₃)) — sedimentary

Fossiliferous limestone (likely a crinoidal or shell-fragment limestone)

Bioclastic limestone, composed chiefly of calcite (CaCO₃)

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Fossil oyster shell (Oyster (family Ostreidae); shell composed chiefly of calcite (CaCO₃)) — fossil

Fossil oyster shell

Oyster (family Ostreidae); shell composed chiefly of calcite (CaCO₃)

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Rounded sedimentary pebble

Likely micritic limestone or calcareous sandstone

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