“The Great Nebraska Sea,” Allan Danzig, 1963 – Future citizens of the U.S. (in 2073) have always lived with the Great Nebraska Sea and can’t imagine life without it.
Comments: A story of how the present is privileged in assumption and logic—i.e., everything is “normal” once it’s around long enough. An example of geologic sf. According to the introduction in Galaxy, Vol. One, the story was originally published as “Fact Article” in Galaxy. Read in Galaxy: Vol. One, which contains a short memoir by Danzig.
Author: See “Allan Danzig” in ISFDB: http://www.isfdb.org/cgi-bin/ea.cgi?11316.