"The traditional view is that mammals were suppressed during the 'age of dinosaurs'," and thus held in check, said co-author Elis Newham, a doctoral student in evolutionary biology at the University of Chicago. "However, our findings were that therian mammals — the ancestors of most modern mammals — were already diversifying considerably before the Cretaceous-Tertiary extinction event," also known as the K-Pg boundary. "I didn't expect to see any sort of drop," said lead author David Grossnickle, also of the University of Chicago.
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