These fragments of rock have fossils of sporn ferns on the surface that date to the Upper Carboniferous. A fern is a type of vascular plant that reproduces by spores. The rocks range in size from 24 cm x 5 cm to 4 cm x 4.5 cm.
- Catalog Number:
- 404444
- Object/Specimen Description:
- Specimen Count:
- 4
- Locality:
- US Great Lakes (MN, WI, IL, IN, OH, MI)
- Collecting Locality:
- North America, United States, Illinois
- Upper Level Taxonomy:
- Plantae, Tracheophyta, Pteridophytina, Polypodiopsida