What kind of flying creatures were there 80mya? I want something like the birds that flock on the backs of hippopotamuses for my herd of apatosaurs.
I'm surmising that a few of the higher hills in Austin would have been islands 80mya and that a sort of sandy subtropical swamp grew there, with live oaks of course. Something like Jekyll Island, on the Georgia coast. Does this sound plausible?
I've googled and wikid the heck out of this, and done a bit of book research. Actually, I've even built a model of the hill out of sculpey, so if there were no islands then, I'm willing to move the time period. 80mya was my best guess for when the sea receded past the Texas Hill Country.