Rock Identifier
Fossilized Bark (Lepidodendron / Sigillaria fossil impression) — fossil
fossil

Fossilized Bark

Lepidodendron / Sigillaria fossil impression

Hardness varies by mineral replacement (typically Mohs 5-7 for quartz/silica), dark grey to black color, dull to sub-vitreous luster, organic cellular structure preserved in stone with distinctive diamond-shaped or parallel leaf scar patterns.

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Physical properties

Hardness varies by mineral replacement (typically Mohs 5-7 for quartz/silica), dark grey to black color, dull to sub-vitreous luster, organic cellular structure preserved in stone with distinctive diamond-shaped or parallel leaf scar patterns.

Formation & geological history

Formed during the Carboniferous period (approx. 359 to 299 million years ago) when ancient swamp forests were buried rapidly in sediment, undergoing permineralization where groundwater rich in silica or other minerals replaced the organic cell walls.

Uses & applications

Used primarily for educational purposes, scientific study of ancient paleoclimates and ecosystems, and as a collectible specimen for fossil enthusiasts.

Geological facts

The fossil typically represents extinct scale trees (such as Lepidodendron) that grew up to 40 meters tall and formed the major component of the vast coal-swamp forests of the Carboniferous period.

Field identification & locations

Easily identified by the repeating scale-like or ribbed geometric patterns on the rock surface resembling tree bark. Found in coal-bearing sedimentary rock strata worldwide, particularly in North America and Europe.

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