Comments on: Life between extinctions: cracking open the Cretaceous period

By: Parvez Kumar

Parvez Kumar — Tue, 24 Apr 2012 21:29:44 +0000

Interesting article. However, I was hoping to have seen some evidence of a denser atmosphere in those bygone times. Thirty years ago, Dr. Dale Russell – an eminenet Canadian paleontologist, and myself (I am now a retired Aerospace Engineer and have worked along with ESA, NASA, JAXA and the CSA on the International Space Station Programme) examined the possibility of the Pterosaur flying and came to the conclusion that it was possible if the air density was between 1.8 ~ 2.00 times that of today’s. I have been approached again, after three decades, to reopen that work as more information is slowly coming to my conclusion. Has ESA ever looked at the ancient atmospheres from an Aerodynamicist’s point of view? Regards. Dr. Parvez Kumar.

By: Pablo

Pablo — Thu, 01 Apr 2010 11:31:46 +0000

Actually, there were prior periods of massive growth in terms of biodiversity: the early Cambrian, for example.

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Fri, 26 Mar 2010 06:06:54 +0000

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By: Leslie Friedlander

Leslie Friedlander — Fri, 26 Mar 2010 00:18:25 +0000

Flowering plants may be earlier than we think. “An uncorrelated relaxed-clock analysis suggests an earlier origin for flowering plants” http://www.pnas.org/content/early/2010/03/15/1001225107.abstract?etoc