The River Products Company of Iowa City recently opened a quarry for crushed stone on the right bank of Iowa river in section 33, township 80 north, range six west. This locality is about one and a quarter miles northeast of Coralville and close to two miles northwest of Iowa City. The rock used is Cedar Valley limestone and the stone is overlain by a few feet of mantle rock largely of glacial origin. The face of the west end of the quarry at the time the first specimens were obtained was a little over fifteen feet high and its floor was from ten to fifteen feet above the water in the river a few yards away.
Proceedings of the Iowa Academy of Science
©1923 Iowa Academy of Science, Inc.
Thomas, A. O.
"Some Large Colonies of Stromatopora Found near Iowa City, Iowa,"
Proceedings of the Iowa Academy of Science, 30(1), 467-470.
Available at: https://scholarworks.uni.edu/pias/vol30/iss1/76