Terrestrial fauna On land, mammals were generally small sized, but a very relevant component of the fauna, with cimolodont multituberculates outnumbering dinosaurs in some sites. Neither true marsupials nor placentals existed until the very end, but a variety of non-marsupial metatherians and non-placental eutherians had already begun to diversify greatly, ranging as carnivores (Deltatheroida), aquatic foragers (Stagodontidae) and herbivores (Schowalteria, Zhelestidae). Various "archaic" groups like eutriconodonts were common in the Early Cretaceous, but by the Late Cretaceous northern mammalian faunas were dominated by multituberculates and therians, with dryolestoids dominating South America.
Terrestrial fauna On land mammals were generally small sized but a very relevant component of the fauna with cimolodont multituberculates outnumbering dinosaurs in some sites Neither true marsupials nor placentals existed until the very end but a variety of non-marsupial metatherians and non-placental eutherians had already begun to diversify greatly ranging as carnivores (Deltatheroida) aquatic foragers (Stagodontidae) and herbivores (Schowalteria Zhelestidae) Various "archaic" groups like eutriconodonts were common in the Early Cretaceous but by the Late Cretaceous northern mammalian faunas were dominated by multituberculates and therians with dryolestoids dominating South America