Geological History
The forest is located in the Driftless Area of Iowa, a region that was not glaciated during the last ice age. The geology of the region shows ancient Silurian period formations. The Yellow River and Paint Creek have rugged, steep walled canyons, showing millennia of erosion, where glacial action would have otherwise smoothed out the features.
Read more about this topic: Yellow River State Forest
Famous quotes containing the words geological and/or history:
“The crystal sphere of thought is as concentrical as the geological structure of the globe. As our soils and rocks lie in strata, concentric strata, so do all men’s thinkings run laterally, never vertically.”
—Ralph Waldo Emerson (1803–1882)
“The custard is setting; meanwhile
I not only have my own history to worry about
But am forced to fret over insufficient details related to large
Unfinished concepts that can never bring themselves to the point
Of being, with or without my help, if any were forthcoming.”
—John Ashbery (b. 1927)