Macroneuropteris is a seed plant that has a temporal range only in the Carboniferous. I found this specimen in the talus near the lab. Most specimens I find are of small leaves, or large pieces of bark. This was more certainly a large leaf. I wanted to show the leaf detail up close, so the photos below include some microscopic views of the leaf veins.
The rise of this species correlates with the fall of Lepidodendrons. When a coal seams forms under an evenly wet climate, they are known to contain Lepidodendrons. However, Macroneuropteris fossils will often appear directly above these in the strata. They were able to dominate varied climates easier.
This is currently a candidate for a collection piece.