DescriptionMissouri River in winter downstream from Yankton, South Dakota.jpg
The Missouri River in winter downstream from Yankton, South Dakota, with Nebraska below and South Dakota above. Bottom left is bluff Quaternary loess (soil deposited by wind) and other buried soil over over Cretaceous Niobrara Formation chalk and Carlile shale. All of this was under the far edge of the Wisconsin Ice Sheet, which departed around 50,000 years ago.
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DescriptionMissouri River in winter downstream from Yankton, South Dakota.jpg
The Missouri River in winter downstream from Yankton, South Dakota, with Nebraska below and South Dakota above. Bottom left is bluff Quaternary loess (soil deposited by wind) and other buried soil over over Cretaceous Niobrara Formation chalk and Carlile shale. All of this was under the far edge of the Wisconsin Ice Sheet, which departed around 50,000 years ago.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
https://creativecommons.org/licenses/by/2.0CC BY 2.0 Creative Commons Attribution 2.0 truetrue