Otozamites sp.
Cycad
Early Jurassic (Pliensbachian)
Talkeetna Mountains, Alaska, USA

Rare 130mm leaf on 150mm slab.

Otozamites is a fossil leaf morphogenus, that being a genus given to a leaf form not associated with a particular completely-known plant species.  It belongs to the extinct order of cycadeoids, Bennittales, which existed from the Permian to the Cretaceous and perhaps longer.