During the summer of 1915 it was the privilege of the writer to work on the geology of the Sparta quadrangle, Wisconsin. In connection with that work a new stratigraphic horizon in the Cambrian was recognized.
Proceedings of the Iowa Academy of Science
©1916 Iowa Academy of Science, Inc.
Shipton, W. D.
"A New Stratigraphic Horizon in the Cambrian System of Wisconsin,"
Proceedings of the Iowa Academy of Science, 23(1), 142-145.
Available at: https://scholarworks.uni.edu/pias/vol23/iss1/23