A cikin jerin laccoci da takardu waɗanda suka yi kwatancen kwatancen da ke tsakanin dabbobi masu shayarwa da sauran burbushin halittu, Cuvier ya sami damar tabbatar da cewa burbushin halittu sun kasance ragowar jinsunan da suka mutu maimakon kasancewa ragowar jinsunan da ke raye har yanzu a wasu wurare a duniya, kamar yadda aka sani. Burbushin halittu da Gideon Mantell, William Buckland, Mary Anning, da Richard Owen da sauransu suka gano sun taimaka wajen tabbatar da cewa an yi imanin cewa akwai 'zamanin dabbobi masu rarrafe' wanda ya riga ya sami rarrabawar lokaci, babban jigon ra'ayoyin juyin halitta.
kwatancen ilimin lissafi da ilimin halittu