Geologic Formations
Cracked Cliffs NPS photo The cliffs along the Niobrara River reveal millions of years of the earth's history. For a description of this geological "layer cake", click to download a PDF of our geology bulletin. You will need Acrobat Reader to open this file. Acrobat is free, and you can download it here. |
Did You Know?
The Niobrara River is the longest river in Nebraska (its total length is 535 miles and it begins in Wyoming). A segment of the middle Niobrara has been designated by Congress as a Wild and Scenic River. More...