The present consideration of the occurrence of many of the more common metals in minute quantities in the rocks had its foundation in an inquiry started by Messrs. Winslow and Roberson, in connection with the investigation of the Lead and Zinc deposits in Missouri, undertaken by the geological survey of that state. Although the work of these authors ended with their general report, the special phases of the investigation were not dropped by the survey. While the later results are by no means complete as yet, owing at that time to circumstances entirely beyond the control of the scientific corps of the organization, it is believed that there were some points reached in sufficient detail to make a general statement worthy of representation in synoptic form.
Proceedings of the Iowa Academy of Sciences
©1902 Iowa Academy of Science, Inc.
Keyes, Charles R.
"Significance of the Occurrence of Minute Quantities of Metalliferous Minerals in Rocks,"
Proceedings of the Iowa Academy of Science, 10(1), 99-103.
Available at: https://scholarworks.uni.edu/pias/vol10/iss1/16