Previous to the present year no fossil diatoms had been found in Iowa. On October 20, 1898, Prof. J. A. Udden, of Rock Island, Ill., while engaged in work for the Iowa Geological survey, found and sent to Prof. S. Calvin, of the State University, some diatomaceous earth. This material was taken from below the loess in Muscatine County, Iowa, and was turned over to the author for examination. It was of a dull, yellow color, composed of sand and decayed vegetable matter and a few diatoms.
Proceedings of the Iowa Academy of Sciences
©1898 Iowa Academy of Science, Inc.
Myers, P. C.
"Report on a Fossil Diatomaceous Deposit in Muscatine County, Iowa,"
Proceedings of the Iowa Academy of Science, 6(1), 52-53.
Available at: https://scholarworks.uni.edu/pias/vol6/iss1/9