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2. Has the utility of Dicynodon for Late Permian terrestrial biostratigraphy been overstated?;Angielczyk;Geology,2003
3. The Jurassic System in Great Britain;Arkell,1933
4. Pagiophyllum simpsonii, a new conifer from the Chinle Formation (Upper Triassic) of Arizona;Ash;J. Paleontol.,1970
5. Upper Triassic floral zones of North America;Ash,1980