From
the sign:
Red
Rock Coulee has a diversity of features from bare arid slopes, to native
grassland and plateau. The main feature is a large area of exposed bearpaw
shale out of which appear dozens of sandstone concretions. These spheroids in
size range from 1.5 to 2.5 metres in diameter and are exposed to varying
degrees from the soft bedrock.
These
concretions were formed in the very sediments upon which they sit. The process
by which concretions are formed leaves them harder and more resistant to
erosional forces than the surrounding material. When the parent material erodes
the spheres are left exposed and they in turn begin to erode.
Photos were taken
September 20, 2014.
Interesting formations and an interesting place - just had to look up more info! Thanks!
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