The entrance to the South Unit was only a couple of miles from our RV park, but the entrance to the North Unit was about a 70 mile drive north, so we only visited it once.
Much of the North Unit encompasses a valley of the Little Missouri River and its floodplain.
The river valley is bounded by colorful eroded bluffs.
A petrified log eroding out of a cliff
The CCC built the stone building at the Riverbend Overlook in the 1930s.
There were lots of Cottonwood trees on the river's floodplain.
One of the more unique spots in this unit was the Cannonball Concretions, where groundwater had formed large, spheroid mineral concretions underground which were now being exposed by erosion.
The bluff where the concretions are found
Some of the exposed concretions
A few colorful insects on blossoms
And more bison claiming the roadway
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