Plant Fossil Record Reflects Just Two Great Extinction Events – Open Access
Cascales-Miñana, B., and C. J. Cleal, 2014, The
plant fossil record reflects just two great extinction
events. Terra Nova. vol. 26, no. 3, pp. 195–200.
"Here we show that the plant fossil record in fact only
provides evidence of two mass taxonomic extinction
events, one through the Carboniferous-Permian
transition, the other during middle-late Permian times."