1. What are the three phases of the \"Cordilleran Orogeny\"? What happened in ea

Question

1. What are the three phases of the "Cordilleran Orogeny"? What happened in each of the phases in terms of rocks formed and style of faulting?

2. In your own words, describe what happened with respect to continent movements in the Mesozoic Era. In particular, which way did North America move?

3. Which of the following is true about land-plant evolution in the Mesozoic Era?

A. Cycads were diverse and widespread. B. Conifers were a major group. C. Angiosperms originated in the Cretaceous.
D. All of the above. E. None of the above.

Explanation / Answer

Cordilleran Orogeny is an event began at the time of Jurassic and continued till Cenozoic.

There are three phases of the Cordilleran orogeny-

•Nevadan orogeny-It was the oldest orogeny which started in Late Jurassic and ended in Cretaceous period. Nevadan orogeny was strongly affected as large volume of granite magma was generated at depth beneath the western edge of North America. Sierra Navada and Southern California are examples of it

•Sevier orogeny-After Nevadan Orogeny,Sevier orogeny came. Northern American plate continued during this time which resulted into large number of overlapping.

•Laramife Orogeny is the last of the 3phases which started in Late Cretaceous to Early Cenozoic phase of the Cordilleran orogeny. In this orogeny many strctural features of the present-day famous mountains were formed for eg Rocky Mountain.

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