Loess (LUSS) = “loose” in German. This landscape was created by the LOOSE silt deposits of the Missouri River Valley being blown up into the state of Iowa, just east of the river, where over time it created rolling hills, lush forests, and steep bluffs.

 
Watch Fran’s introductory Thor’s Woods video on the Loess Hills:

 

The video below explains a bit more of the geology — how the hills were formed and the fragility of the soil — as well as providing a variety of pictures of the area:

 
More on the Loess Hills of Iowa:
Wikipedia
Iowa Geological Survey
Geology of the Loess Hills, Iowa (USGS)
Explore Iowa: Loess Hills
The Nature Conservancy
Loess Hills Nat’l Scenic Byway
Preserving the Loess Hills

 

 

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