Rock Identifier
Fossilized leaf or plant impression in shale (Carbonized/impressed plant fossil, likely in fine-grained shale or mudstone; exact taxon indeterminate from the image) — fossil
fossil

Fossilized leaf or plant impression in shale

Carbonized/impressed plant fossil, likely in fine-grained shale or mudstone; exact taxon indeterminate from the image

AI-generated identification · may be incorrect

Thin, tan-brown, platy specimen with a layered sedimentary matrix and raised/flattened plant-like surface pattern. Matrix is likely soft to moderately hard (about Mohs 2–4), earthy to dull luster, with fine bedding and easy cleavage along layers.

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Physical properties

Thin, tan-brown, platy specimen with a layered sedimentary matrix and raised/flattened plant-like surface pattern. Matrix is likely soft to moderately hard (about Mohs 2–4), earthy to dull luster, with fine bedding and easy cleavage along layers.

Formation & geological history

Formed when plant material was buried in oxygen-poor mud, leaving a carbon film or impression that lithified into shale or mudstone; age cannot be determined visually and may range from Paleozoic to Cenozoic.

Uses & applications

Primarily used for education, collecting, and display; uncommon attractive examples may be sold as cabinet specimens, but it has no major industrial or jewelry use.

Geological facts

The visible pattern may represent a leaf, bark fragment, or other plant tissue rather than a complete identifiable species. Many plant fossils preserve shape mainly as impressions after the original organic matter decayed.

Field identification & locations

Common in finely laminated lake, floodplain, and delta sediments; inspect for veins, branching, carbon-dark films, and continuous bedding. Avoid soaking or aggressive cleaning because shale can split and impressions can abrade.

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