Geology of the Alston district Houghton and Baraga Counties, Michigan
The copper-bearing sediments and flows of Keweena age which underlie the northwest side of Keweenaw Point form a conformable series which to the southeast has been thrust over the Cambrian Jacobsville sandstone. The stratigraphic correlation of the Freda sandstone, which lies at the top of the coppe...
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Roberts, Ellis Earl (1940) Geology of the Alston district Houghton and Baraga Counties, Michigan. Master's thesis, California Institute of Technology. doi:10.7907/YB0S-SR57. https://resolver.caltech.edu/CaltechETD:etd-04032009-144817 <https://resolver.caltech.edu/CaltechETD:etd-04032009-144817>