In his Report of a Geological Exploration of a part of Iowa, Wisconsin, and Illinois, made under instructions from the Secretary of the Treasury of the United States in the autumn of the year 1839, Dr. David Dale Owen describes and figures a small fossil from the “Coralline beds of the Upper Magnesian Cliff Limestone of Iowa and Wisconsin,” under the name of Lunnlites? Ductioloides, is described briefly, as follows, on page 68.
Proceedings of the Iowa Academy of Sciences
©1892 Iowa Academy of Science, Inc.
"On the Structure and Probable Affinities of Cerionites dactylioides Owen,"
Proceedings of the Iowa Academy of Science, 1(Pt. 3), 13-15.
Available at: https://scholarworks.uni.edu/pias/vol1/iss3/5