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CNN:Mammal groups showed up before dinos died out
CNN article appears at:
Major mammal groups appeared before dinosaurs died out, study says
April 29, 1998
The work suggests at least five major lineages, which today include
such creatures as rodents, elephants and armadillos, might have
appeared more than 100 million years ago.
The results, based on analysis of genes, are presented in Thursday's
issue of the journal Nature by S. Blair Hedges and a colleague at
Pennsylvania State University. Hedges and co-authors published a
similar study in 1996, but their new study includes many more genes.