Skip to main content
Advanced Search

Filters: Tags: 26083 (X)

3 results (57ms)   

View Results as: JSON ATOM CSV
thumbnail
The area of this data set includes the classic geology and mineral deposits of the Keweenaw Peninsula, renowned for the occurrence of great volumes of Middle Proterozoic flood basalts and the world's largest concentration of native copper. Native copper was mined there continuously from the 1840's to the 1960's. For the earlier part of that period the Keweenawan native copper district was the principal source of copper for the United States.
thumbnail
The Quaternary Geologic Map of the Lake Superior 4° x 6° Quadrangle was mapped as part of the Quaternary Geologic Atlas of the United States. The atlas was begun as an effort to depict the areal distribution of surficial geologic deposits and other materials that accumulated or formed during the past 2+ million years, the period that includes all activities of the human species. These materials are at the surface of the earth. They make up the "ground" on which we walk, the "dirt" in which we dig foundations, and the "soil" in which we grow crops. Most of our human activity is related in one way or another to these surface materials that are referred to collectively by many geologists as regolith, the mantle of...
Categories: Web Site; Tags: 26003 = Alger, 26009 = Antrim, 26011 = Arenac, 26013 = Baraga, 26019 = Benzie, All tags...
thumbnail
The Quaternary Geologic Map of the Lake Superior 4� x 6� Quadranglewas mapped as part of the Quaternary Geologic Atlas of the United States.The atlas was begun as an effort to depict the areal distribution ofsurficial geologic deposits and other materials that accumulated orformed during the past 2+ million years, the period that includes allactivities of the human species. These materials are at the surface ofthe earth. They make up the "ground" on which we walk, the "dirt" inwhich we dig foundations, and the "soil" in which we grow crops. Mostof our human activity is related in one way or another to these surfacematerials that are referred to collectively by many geologists asregolith, the mantle of fragmental...
Tags: 26003 = Alger, 26009 = Antrim, 26011 = Arenac, 26013 = Baraga, 26019 = Benzie, All tags...


    map background search result map search result map Quaternary Geologic Map of the Lake Superior 4° x 6° Quadrangle, United States and Canada Quaternary Geologic Map of the Lake Superior 4� x 6� Quadrangle,United States and Canada Geology and Mineral Deposits of the Keweenaw Peninsula and Vicinity, Michigan Geology and Mineral Deposits of the Keweenaw Peninsula and Vicinity, Michigan Quaternary Geologic Map of the Lake Superior 4° x 6° Quadrangle, United States and Canada Quaternary Geologic Map of the Lake Superior 4� x 6� Quadrangle,United States and Canada