This geological map indicates types of diabase and gabbro found in the Deer Lake Complex of Itasca County, Minnesota by geologist, Mark Severson. Each type of diabase and gabbro, as well as sedimentary and volcani crock are indicated with a specific color. The outline of Deer Lake Complex, faults, and drill holes are also included.
Contributor:
Severson, Mark
Created:
1981
Contributed By:
University of Minnesota Libraries, University Archives.
This hand drawn map depicts the geological elements found in Greenstone and Bass Lake, near Virginia, Minnesota by geologist, Mark Severson. Flows, formations and rock types are included on this map through individual colors and abbreviations to indicate where they were found. This includes mafic flow, magnetic black chert and jasper iron format...
Creator:
United States Geological Survey
Contributor:
Severson, Mark
Contributed By:
University of Minnesota Libraries, University Archives.
This hand drawn map depicts the geological elements found in Greenstone near Virginia, Minnesota by geologist, Mark Severson. Rock units are indicated by specific color and abreviation and include mafic agglomerate, oacite porphyry, metadiabase, iron formation, foliated tuff, lithic tuff, phyroclastic tuff, and breccia. Other geological structur...
Creator:
United States Geological Survey
Contributor:
Severson, Mark
Contributed By:
University of Minnesota Libraries, University Archives.
This hand drawn map depicts the geological elements and formations found around Sixmile Lake in St. Louis County, Minnesota by geologist, Mark Severson. Individual rock units are color coated and include iron formation, greenstone, hypabyssal intrusives, aggomerate-lapilli, graphite schist, siliceous tuff, siliceous epidote and lamprophyre dike....
Contributor:
Severson, Mark
Created:
1978
Contributed By:
University of Minnesota Libraries, University Archives.