Some years ago Dr. William H. Norton discovered a sandstone formation, about a third of a mile southeast of Lisbon in Linn County, Iowa. On the hillside it appeared as a small outcropping of a soft, light colored or white sandstone, fine-grained, weathering to yellow.
Proceedings of the Iowa Academy of Science
©1927 Iowa Academy of Science, Inc.
Hendricks, Robert and Knight, Nicholas
"Some Iowa Sandstone,"
Proceedings of the Iowa Academy of Science, 34(1), 247-248.
Available at: https://scholarworks.uni.edu/pias/vol34/iss1/62