Orlando, Mario E2020-04-212020-04-211977-04https://hdl.handle.net/11299/212465A Plan B Paper submitted to the faculty of the Graduate School of the University of Minnesota by Mario E. Orlando as a Requirement for the Degree Master of Science, April 1977.enPlan Bs (project-based master's degrees)Department of Earth and Environmental SciencesUniversity of Minnesota DuluthMaster of ScienceMaster of Science in GeologyScholarly Text or Essay