From: owner-DINOSAUR@usc.edu [mailto:owner-DINOSAUR@usc.edu]
On Behalf Of GUY LEAHY
I wonder if this could have been a factor at the K/Pg boundary?
http://www.journals.uchicago.edu/doi/abs/10.1086/595756
Interesting!
Robertson et al. (2004) highlight a burrowing habit as a likely survival
trait in the first hours of the Cenozoic, while Smith & Botha (2005) suggest
burrowing therapsids (as organisms adapted to dealing with periods of
dysoxia and hypercapnia) may have had a selective advantage over
non-burrowers at the P/Tr event.