This is an impressive fossil willow (Salix) leaf from the Green River Formation, Utah. It is in very good condition and the dark leaf stands out against the lighter stone. The large leaf section is not likely related to the small leaf tip near it, but the are the same species, Salix linearis.
While the Green River Formation is best know for its fish fossils, other areas produce incredible plant fossils.
Comes with an acrylic stand.
A note on Green River leaf identifications. There are over 60 described leaf bearing plants from this formation, many of which have very similar leaves. We've done our best to provide identifications based on the resources available to us, but are not paleobotany experts, so we can not guarantee that all will be 100% correct.