Among the rock formations of Allamakee county is one to which the geologists have given the name of Jordan Sandstone. This rock first begins to show above the Mississippi river at McGregor, Iowa. At Waukon Junction, nine miles above, there is a fine exposure from the station up to and above "The Painted Rock" showing its characteristic buttresses, caves, fissures and over-hanging ledges. At New Albin it has risen to more than two hundred feet above the river.
Proceedings of the Iowa Academy of Science
©1931 Iowa Academy of Science, Inc.
"The Rock Shelters of Allamakee County, Iowa, a Preliminary Survey,"
Proceedings of the Iowa Academy of Science, 38(1), 185-194.
Available at: https://scholarworks.uni.edu/pias/vol38/iss1/41