I'm showing you this animation because I think it illustrates the difficulties of explaining things that exist or occur at different scales, and because it's kinda fun:
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Quite fun indeed. But graphics could have been better ;-)
There's been a number of validations that oxygen content was up to 10% higher during the Cretaceous but I wouldn't be too certain about lightning-originated wild fires except perhaps at the end of the period. Correlative studies have shown that the solar system had just traversed a 100 million year, relatively open space between arms of the galaxy. The earth had a very low level of cosmic radiation during this period and therefore a mild climate that was uniformly warm right up to the poles. Therefore you would expect a lower level of cloud cover, atmospheric turbulance and electical based storms.
This article might prove interesting:
http://www.freerepublic.com/focus/f-news/845563/posts
Terrence Zavecz. Nodal Convergence (Kindle Location 1143).
As the period approached the K-T extinction, the solar system had just entered a densely packed edge of one of the galaxy's arms. Lots of debris and lots of cosmic radiation ... lots of cometary material floating.
As a bit of fun I wrote a referenced set of novels on this. You can get a feel for them at http://www.GraviDynamics.net
Terrence Zavecz