@article {72401,
	title = {Potassium-Argon Dates and the Tertiary Floras of North America},
	journal = {American Journal of Science},
	volume = {262},
	year = {1964},
	pages = {945-974},
	keywords = {Dating, Feldspar, Flora, fossils, North America, Tertiary, Volcanic},
	author = {Evernden, J. F. and James, G. T.}
}
