This paper discussed the heavy beds of poikilitic sandstone found immediately underlying the Saint Peter sandstone of normal facies in several deep wells of eastern Iowa.
Proceedings of the Iowa Academy of Science
©1933 Iowa Academy of Science, Inc.
Norton, W. H.
"Some Buried "Pictured Rocks","
Proceedings of the Iowa Academy of Science, 40(1), 135-135.
Available at: https://scholarworks.uni.edu/pias/vol40/iss1/66