• Which mountain building event in the Mesozoic lead to the uplift of the curren

Question

• Which mountain building event in the Mesozoic lead to the uplift of the current Rocky mountains?

• When did the John Day area form, what caused it and why is it important?

Place each of the following events into the correct time period listed below: Cenozoic, Mesozoic, Paleozoic, Proterozoic, Archean, Hadean Development of the Cascade Mountains; Sundance Sea; Development of the first reptiles Greenstone belts; Mammals first appear; Breakup of Pangaea; Antler orogeny; Nevadan orogeny, Atmosphere develops

Explanation / Answer

Ans. a.Ornithischia group of dinosaurs were herbivorous ans saurischians were considered as carnivorous. Ornithiscians had the pelvic structure similar to a bird with pubis pointed forward- development of the first reptiles.

b.

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