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Re: K-Pg extinction global firestorms

On Wed, 27 Mar 2013, Ben Creisler wrote:

A new paper of interest:

Douglas S. Robertson, William M. Lewis, Peter M. Sheehan & Owen B. Toon (2013)
K-Pg extinction: Reevaluation of the heat-fire hypothesis.
Journal of Geophysical Research: Biogeosciences (advance online publication)
DOI: 10.1002/jgrg.20018

So, what about the other recent news that it could have been a comet? That has a different composition from, say, an asteroid. It would seem to rule out a comet.