This is a very big beautiful specimen of Sphenophyllum emarginatum leaves, a horsetail species, from the famous Mazon Creek Lagerstatten of Illinois. The Mazon Creek fossil beds are a deposit with exceptional fossil preservation, known as a lagerstätte, found in Illinois. This location of the late Carboniferous age ranks among the great fossil sites around the world.

Sphenophyllum emarginatum

Carboniferous, Pennsylvanian (300 mil y)

Coal City, Illinois, USA

108 mm - 4.3"

Very good