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Duluth Complex
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The Duluth Complex, the related Beaver Bay Complex, and the associated North Shore Volcanic Group are rock formations which comprise much of the basement bedrock of the northeastern part of the U.S. s
The Sawtooth Mountains rising from Lake Superior
The Sawtooth Mountains rising from Lake Superior
North Shore Volcanics: Palisade Head (foreground) and Shovel Point (midground), both rhyolitic extrusions of the Midcontinent Rift; Sawtooth Mountains
North Shore Volcanics: Palisade Head (foreground) and Shovel Point (midground), both rhyolitic extrusions of the Midcontinent Rift; Sawtooth Mountains on horizon
Layered gabbro near Duluth
Layered gabbro near Duluth
Duluth's Enger Tower, constructed of local Keweenawan rocks, atop a gabbro knob (foreground)
Duluth's Enger Tower, constructed of local Keweenawan rocks, atop a gabbro knob (foreground)
Geology of Minnesota
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The geology of Minnesota comprises the rock, minerals, and soils of the U.S. state of Minnesota, including their formation, development, distribution, and condition.
Duluth Complex
…the related Beaver Bay Complex, and the associated North Shore Volcanic Group are rock formations which comprise much of the basement bedrock of the northeastern part of the U.S. state of Minnesota in central North America. The Duluth and Beaver Bay complexes are intrusive rocks formed about 1.1 billion years ago…
Shaded relief image: Superior Upland in the northeast, the flat Red River Valley in the northwest, Central Minnesota's irregular landscape, the Coteau
Shaded relief image: Superior Upland in the northeast, the flat Red River Valley in the northwest, Central Minnesota's irregular landscape, the Coteau des Prairies and Minnesota River in the southwest, and the southeast's dissected Driftless Area along the Mississippi River below its confluences with the Minnesota and St. Croix in East Central Minnesota
Limestone bluffs cut by the Root River in Olmsted County
Limestone bluffs cut by the Root River in Olmsted County
Limestone over sandstone in the gorge of Minnehaha Creek
Limestone over sandstone in the gorge of Minnehaha Creek