Rock Identifier
Fossil plant impression, likely fern or leaf (Indeterminate fossilized vascular-plant compression; possibly a fern frond or other Paleozoic plant) — fossil
fossil

Fossil plant impression, likely fern or leaf

Indeterminate fossilized vascular-plant compression; possibly a fern frond or other Paleozoic plant

AI-generated identification · may be incorrect

A dark, branching carbonaceous impression occurs in a pale, fine-grained sedimentary slab, likely shale or siltstone. Matrix hardness is roughly Mohs 2–4, with dull to slightly earthy luster and thin fissile layering; the fossil itself is not identifiable to species from the image.

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Physical properties

A dark, branching carbonaceous impression occurs in a pale, fine-grained sedimentary slab, likely shale or siltstone. Matrix hardness is roughly Mohs 2–4, with dull to slightly earthy luster and thin fissile layering; the fossil itself is not identifiable to species from the image.

Formation & geological history

Plant material was buried in quiet water, compressed, and preserved as a carbon film or mineral impression during diagenesis. Geological age cannot be determined visually, but similar specimens range from Paleozoic to Mesozoic strata.

Uses & applications

Primarily a teaching, display, and collecting specimen; scientifically important fossils should be documented and curated rather than commercially prepared.

Geological facts

Branching geometry may represent a fern, horsetail, twig, or root, and apparent morphology can be distorted by splitting along bedding planes.

Field identification & locations

Look for bedding-parallel carbon films, repeated veins or branching axes, and a fine shale matrix; avoid acids and excessive cleaning. Identification requires locality and stratigraphic information, commonly from coal measures and other lake or floodplain deposits.

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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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Porous limestone pebble (Calcite-rich limestone (primarily CaCO₃); exact identification is uncertain from the image) — sedimentary

Porous limestone pebble

Calcite-rich limestone (primarily CaCO₃); exact identification is uncertain from the image

sedimentary
Weathered fossil bone fragment (identification uncertain) (Fossilized bone; exact taxon and mineral composition cannot be determined from the image) — fossil

Weathered fossil bone fragment (identification uncertain)

Fossilized bone; exact taxon and mineral composition cannot be determined from the image

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