Late Jurassic Western North American Terrain?

[dunn1@IDT.NET]

Would someone please give me a precis of the terrain of the Late 
Jurassic in Western North America as enjoyed by the likes of 
Allosaurus f. and Stegosaurus s.?  I'm fairly familiar with the Late 
Cretaceous but need input on the Jurassic.  What would Dinosaur 
National park have been like when the fossils were still fleash-clad: 
flora, geography, etc.  No need for exhaustive analysis or source 
citation, and off-list is preferable.  Feel free to wax poetic as 
long as you also wax specific.

Thanks a lot for any help.


Larry

I'm not interested in how dinosaurs lived
I'm just glad they're dead

Jack Horner as quoted by Dan Quayle