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A review of selected triassic to Early Cretaceous ferns
After becoming nearly extinct during the Permian, the ferns began a slow recovery during the Triassic as the climate of the earth moderated, but with the rapid expansion of the angiosperms during the Late Cretaceous, they once again became reduced in variety and greatly restricted in distribution.
A C4 plant from the Pliocene
Fossil evidence is reported indicating that C4 plants occurred at least during the late Tertiary period, suggesting that ancestral non-Kranz C3 grasses originated during the Cretaceous period.
MILLEROCAULIS, A NEW GENUS WITH SPECIES FORMERLY IN OSMUNDACAULIS MILLER (FOSSILS: OSMUNDACEAE)
- W. D. Tidwell
Tomlisonia thomassonii, gen. et sp. nov., a permineralized grass from the upper miocene Ricardo Formation, California
The occurrence of this fossil grass in the Ricardo Formation suggests, at least by the Miocene, the establishment of a Mediterranean chaparral type grassland in the Mojave desert region and climatic condition conducive to the growth and expansion of several grass species.
INTERCONNECTED REPRODUCTIVE AND VEGETATIVE REMAINS OF POPULUS (SALICACEAE) FROM THE MIDDLE EOCENE GREEN RIVER FORMATION, NORTHEASTERN UTAH.
A new specimen from the Middle Eocene Evacuation Creek Member of the Green River Formation in northeastern Utah shows a twig with several leaves of Populus wilmattae Cockrell and a fruiting raceme…
Aurealcaulis crossii gen. et sp. nov., an arborescent, osmundaceous trunk from the Fort Union Formation (Paleocene), Wyoming
Aurealcaulis crossii is the first arborescent member of the Osmundaceae of Tertiary age and the second arb fluorescent form in this family reported from the Northern Carboniferous period.
THE OLDEST MICROSAUR (AMPHIBIA)
Utaherpetonfranklini n. gen. and sp., from the Manning Canyon Shale Formation of Utah, is the oldest known microsaur. The horizon is dated as equivalent to the lowermost Namurian B of Europe…
Palmoxylon simperi and Palmoxylon pristina: Two Pre-Cretaceous Angiosperms from Utah
Petrified palm stems from the Middle Jurassic Arapien Shale Formation near Redmond, Sevier Country, Utah, are the first unequivocal angiosperms reported from pre-Cretaceous strata.