In the May and June numbers American Geologist the writer published a preliminary description and classification of the crystalline rock of Missouri. Since that time considerable more field work has been done, and much new material gathered which is now being examined in the laboratory.
Proceedings of the Iowa Academy of Sciences
©1889 Iowa Academy of Science, Inc.
"The Crystalline Rocks of Missouri,"
Proceedings of the Iowa Academy of Science, 1(Pt. 1), 66-68.
Available at: https://scholarworks.uni.edu/pias/vol1/iss1/36