title: Comment on "Abrupt and gradual extinction among Late Permian land vertebrates in the Karoo basin, South Africa".
authors.affiliation: Museum of Comparative Zoology, Harvard University, 26 Oxford Street, Cambridge, MA 02138, USA. cmarshal@oeb.harvard.edu
authors.forename: Charles
authors.initials: C
authors.lastname: Marshall
mesh_terms: D000818:Animals; D005075:Biological Evolution; D005580:Fossils; D008954:Models, Biological; D013019:South Africa; D014714:Vertebrates