A biothermal facies in the Silurian of eastern Iowa, E. E. Hinman, 1968, 52 p., 13 figs., 1 table, 1 appendix. The Report of Investigations were the first detailed studies on certain aspects of Iowa geology, and are historically important. Some concepts and conclusions in some of the Report of Investigations series are now considered out-of-date as a result of more recent findings.
