Pabian, R. K., Swinehart, J. B., 1980. Geology Along the Republican River Valley Near Red Cloud, Nebraska (FG-9): 25 pp., size 8.5" x 11". Description: In the Red Cloud area, the oldest rocks exposed along the south side of the Republican River valley were deposited about 95 million years ago in Late Cretaceous age seas. Directly overlying these rocks in most places are unconsolidated stream sediments, called alluvium, and aeolian (wind) deposits laid down in Pleistocene time beginning about two million years ago.