Words by Lisa Whalen
Video/Model: by Phil Prince
The Ouachita orogeny occurred ~300 million years ago when part of South American collided with the southern part of North America.
In this model Phil Prince takes us to the Ouachita Mountains of Arkansas and Oklahoma. Here you will see how the strength of different rock layers coupled with deep erosion can produced the characteristic shape of this range. Sinuous ridges formed from chert snake around valleys scooped out of shale abutting a broad sandstone plateau.