(Left) In this reconstruction of a lowland Jurassic forest by Douglas Henderson, a pair of diplodoci make their way across a floodplain dotted with cycadeoid- type plants.




By the Late Jurassic the predominantly lowland character of the continents had begun to change. 

The climate became less humid, vegetation thinned and in many areas like Asia and North America adapted to more arid conditions. Flowering trees and bushy angiosperms appeared. Beeches, oaks, magnolias, and hickory now shared the landscape with cycads, conifers and ferns.

(Below left) Cycadeoidea marylandica, fossilized stem of a cycadeoid
Jurassic through the Cretaceous 		(Below right) An upland Cretaceous forest where dawn redwoods and early angiosperms dominate, while Cycadales and Cycadeoides make up the understory vegetation.

The appearance of woody, tough-leafed vegetation also produced a shift in herbivores. The long- necked, peg- toothed sauropods were replaced by hadrosaurs, iguanodons, and ceratopsians with massive batteries of teeth capable of rending anything from pine needles to thorny cycad leaves.