So-called "alkali" spots are somewhat common in certain parts of Iowa. They occur mainly in the Wisconsin drift soil area but occasionally areas are also found in the Iowan drift soil area. In many cases the peat and alkali areas appear in association, the peat occurring in an old lake bed or depression while the alkali spots are found on the uplands adjacent to the peat, occasionally forming a ring around the peat bed.
Proceedings of the Iowa Academy of Science
©1931 Iowa Academy of Science, Inc.
Smith, Sanford M. and Smith, F. B.
"Some Nitrification Studies on an Alkali Soil in Iowa,"
Proceedings of the Iowa Academy of Science, 38(1), 327-331.
Available at: https://scholarworks.uni.edu/pias/vol38/iss1/112