Mammalian Adaptive Radiation at the KT boundary???

This week a paper was published in Nature that calls into question the idea that mammals took off and diversified filling niches vacated by the extinction of the dinosaur megafauna at the end of the Cretaceous. The data is molecular and the paper is at least somewhat controversial. You can find a nice write up about it at PZ Meyer’s Pharyngula Blog with graphs, trees and links. Another good coverage of this article is at: Mike Dunford’s Blog, The Questionable Authority