Ma), and the Sprigg Orogeny (Miocene - present).

Orogens

Orogens show a great range of characteristics,but they may be broadly divided into collisional orogens and noncollisional orogens (Andean-type orogens). Collisional orogens can be further divided by whether the collision is with a second continent or a continental fragment or island arc. Repeated collisions of the latter type, with no evidence of collision with a major continent or closure of an ocean

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