In a report recently made to the State Geological Survey, the writer communicates in detail some facts regarding the brecciated zone of the Devonian in Linn county, Iowa, and the terranes subjacent. The following is in part a brief summary of this report.
Proceedings of the Iowa Academy of Sciences
©1893 Iowa Academy of Science, Inc.
Norton, William Harmon
"Notes on the Lower Strata of the Devonian Series in Iowa,"
Proceedings of the Iowa Academy of Science, 1(Pt. 4), 22-24.
Available at: https://scholarworks.uni.edu/pias/vol1/iss4/8