Rock Identifier
Fern Fossil (Pteridophyte impression in sedimentary matrix) — fossil
fossil

Fern Fossil

Pteridophyte impression in sedimentary matrix

AI-generated identification · may be incorrect

Mohs hardness 3-4 for the host rock, grey to brown color, dull earthy luster, amorphous crystal structure of the mudstone matrix with preserved organic carbon silhouettes.

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Physical properties

Mohs hardness 3-4 for the host rock, grey to brown color, dull earthy luster, amorphous crystal structure of the mudstone matrix with preserved organic carbon silhouettes.

Formation & geological history

Formed during the Carboniferous period approximately 300 million years ago when ancient plant debris was rapidly buried in fine-grained anaerobic river silt or swamp sediments.

Uses & applications

Valued primarily for scientific study, educational displays, and as a collectible specimen for fossil enthusiasts.

Geological facts

Fossilized ferns from the Carboniferous period contributed significantly to the global coal deposits mined today. Exceptional preservation can capture minute cellular details of ancient fronds.

Field identification & locations

Identify by distinctive feathery impression patterns embedded in layers of shale or siltstone. Commonly found in coal-bearing sedimentary rock formations worldwide.

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