@article {7744,
	title = {Mass turnover and heterochrony events in response to physical change},
	journal = {Paleobiology},
	volume = {31},
	number = {2},
	year = {2005},
	pages = {157-174},
	keywords = {extinction, heterochrony, macroevolution, speciation},
	author = {Vrba, Elisabeth S.}
}
