Alethopteris, a seed fern from the Carboniferous swamp forests 300 million years ago. This specimen is from Kansas. The fossils are on undulating bedding planes, and the specimen has beautiful brown tones (I'm used to darker, flatter UK coal measures material!)

#FossilFriday #NotAFernFriday ⚒🌏🌱🧪🌿🔬