The interglacial deposits of northeastern Iowa embrace the peat and forest bed which has been known to well diggers since the early settlement of the region, but which, for this region, was first brought prominently to the attention of science by the writings of McGee, and the Buchanan gravels of Calvin. These deposits represent two distinct horizons in the glacial series. The Pleistocene formations of northeastern Iowa have received more or less attention from geologists since first the region was traversed by Owen. The great Iowan boulders of this region impressed Owen as they have impressed every intelligent observer since, but he believed that these enormous masses of granite could only have been transported to their present position by floating ice “drifted by currents setting in from the north, before the land emerged from the ocean.”
Proceedings of the Iowa Academy of Sciences
©1897 Iowa Academy of Science, Inc.
"The Interglacial Deposits of Northeastern Iowa,"
Proceedings of the Iowa Academy of Science, 5(1), 64-70.
Available at: https://scholarworks.uni.edu/pias/vol5/iss1/13