Duluth Complex

<p>The Duluth Complex, the related Beaver Bay Complex, and the associated North Shore Volcanic Group are rock formations which comprise much of the <a href="/facts/Basement_(geology)/nThFlUPv">basement</a> <a href="/facts/Bedrock/mn9WCgtX">bedrock</a> of the <a href="/facts/Geology_of_Minnesota/NwVEK3tC">northeastern part</a> of the <a href="/facts/U.S._state/PFwcRIYQ">U.S. state</a> of <a href="/facts/Minnesota/ncgVuC4Q">Minnesota</a> in central North America. The Duluth and Beaver Bay complexes are <a href="/facts/Intrusion/y65IUQps">intrusive</a> rocks formed about 1.1 billion years ago during the <a href="/facts/Midcontinent_Rift/dNYaupzw">Midcontinent Rift</a>; these adjoin and are interspersed with the <a href="/facts/Extrusive/AAFoj1BF">extrusive</a> rocks of the North Shore <a href="/facts/Volcanic_group/kLzoGwmu">Volcanic Group</a> produced during that same geologic event. These formations are part of the <a href="/facts/Laurentian_Upland/Uofcay76">Superior Upland</a> physiographic region of the United States, which is associated with the <a href="/facts/Laurentian_Upland/Uofcay76">Laurentian Upland</a> of the <a href="/facts/Canadian_Shield/TklzY7Ln">Canadian Shield</a>, the core of the <a href="/facts/North_American_Craton/G54C2qc3">North American Craton</a>.
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Duluth Complex open-in-new

Duluth Complex