Mesembrioxylon stokesi, sp. nov., from the Lower Cretaceous Cedar Mountain Formation of Utah is described and compared with other species of Mesembrioxylon. Mesembrioxylon stokesi is similar to Aptian members of this genus in having a combination of wood parenchyma and septate tracheids. This lends some support to the Cedar Mountain Formation being partially Aptian in age.
Thayn, G. F. and Tidwell, W. D.
"Flora of the Lower Cretaceous Cedar Mountain Formation of Utah and Colorado, Part II, Mesembrioxylon stokesi,"
Great Basin Naturalist: Vol. 44
, Article 5.
Available at: http://scholarsarchive.byu.edu/gbn/vol44/iss2/5