| Minnesota (St. Louis County), Proctor — Geology of Duluth Harbor | | | Lake Superior is situated over the Midcontinent Rift, which is a rupture in the North American continent that formed a great rift valley from the Lake Superior region southwest to Kansas about 1.1 billion years ago. For about 20 million years as the rift valley opened, basaltic lavas erupted into it, accumulating to a thickness of up to 20 kilometers in the Lake Superior region. After the rifting and volcanic activity ended, the great thickness of dense basalt here depressed the crust into a . . . — Map (db m5113) HM | | Minnesota (St. Louis County), Proctor — Minnesota’s Seaport / Welcome to Minnesota | | | Minnesota’s Seaport. More than three billion tons of iron ore, along with millions of tons of grain, lumber, fish, and coal, have passed through the Duluth-Superior harbor since the beginning of Minnesota’s Iron Age. The first ore from the rich Mesabi Range left the harbor for smelters on the lower lakes in 1892, and by 1916 yearly shipments had reached nearly 38 million tons. Huge loading docks, built first of wood and later of steel and concrete, could load four of five ore-carrying lake . . . — Map (db m3094) HM | | Minnesota (St. Louis County), Proctor — The Gate | | |
1976
Stainless Steel
David von Schlegell (1920 – 1992)
The stainless steel sculpture functions as a metaphor, tying the horizontal lines of the land and Lake Superior, which are both very visible from this location, together at the point of intersection with the City of Duluth. The Gate serves to recognize the importance of Duluth, as not only a gateway to Minnesota's north shore, but also to the world through the Great Lakes St. Lawrence Seaway that extends . . . — Map (db m4756) HM |
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