Fossil fern
Fossil
Also called Fern
About it
Fronds pressed as dark films on shale or inside ironstone nodules; many Carboniferous "ferns" were seed ferns that bore seeds. Mazon Creek in Illinois, St Clair in Pennsylvania, and the Nova Scotia coalfields are classic.
- Type
- Fossil (plant)
- Group
- Fern and seed fern (plant)
- Colours
- black, brown, silvery white, on grey shale or in tan ironstone
- Transparency
- opaque
- Periods
- Carboniferous, Permian
Typical values: real specimens vary. For more, see mindat.org.