Ancient Tropical Sea

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<blockquote>"First quarried commercially in St. Paul in 1856 and in Minneapolis in 1864 . . . [Platteville limestone] underlay much of the two downtowns, and builders often simply quarried it on or near the construction site. The casual removal of stone eventually became such a problem that the city of St. Paul passed an ordinance forbidding people from quarrying it in the streets." <br>
<blockquote>"First quarried commercially in St. Paul in 1856 and in Minneapolis in 1864 . . . [Platteville limestone] underlay much of the two downtowns, and builders often simply quarried it on or near the construction site. The casual removal of stone eventually became such a problem that the city of St. Paul passed an ordinance forbidding people from quarrying it in the streets." <br>
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''~From Larry Millett, ''Lost Twin Cities''
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~From Larry Millett, ''Lost Twin Cities''
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Current revision

Winning Nomination

500 million years ago during the Ordovician period, a shallow tropical sea covered much of North America, and its sandy seashore extended diagonally across the southern part of what is now Minnesota. At that time, Minnesota was near the equator. An abundance of aquatic life lived in this sea, including corals, trilobites, clams, and snails. Over millions of years, the carbonate shells from these marine organisms deposited on the ocean floor and accumulated to form the limestone that is so familiar in southeastern Minnesota.
This limestone is an important part of the Twin Cities story. A layer of Platteville eventually formed the shelf over which St. Anthony Falls dropped, creating the waterpower for the manufacturing center of Minneapolis and the head of navigation at St. Paul. Moreover, limestone was quarried and used as a building material. The buff and gray color of Minnesota limestone can be seen all over the Twin Cities, from hundreds of basement foundations, to its earliest territorial buildings, to 19th-century landmarks like the Washburn A Mill, the Pillsbury A Mill, and the Stone Arch Bridge. It continues to be a favored building material, especially the Kasota Stone visible on the Wells Fargo Tower, LaSalle Plaza, the Federal Reserve Bank, and the new Target Plaza. One doesn’t have to go far in Minneapolis and St. Paul to find the remains of the sea creatures that inhabited our state hundreds of millions of years ago.
~David Stevens, Minneapolis, MN


Contents

History

What goes around, stays around

The past truly is all around us. Nominator David Stevens, public programs coordinator at Mill City Museum in Minneapolis, explains: "500 million years ago during the Ordovician period, a shallow tropical sea covered much of North America, and its sandy seashore extended diagonally across the southern part of what is now Minnesota. At that time, Minnesota was near the equator. An abundance of aquatic life lived in this sea, including corals, trilobites, clams, and snails. Over millions of years, the carbonate shells from these marine organisms deposited on the ocean floor and accumulated to form the limestone that is so familiar in southeastern Minnesota.

"This limestone is an important part of the Twin Cities story. A layer of Platteville [limestone] eventually formed the shelf over which St. Anthony Falls dropped, creating the waterpower for the manufacturing center of Minneapolis and the head of navigation at St. Paul. Moreover, limestone was quarried and used as a building material. The buff and gray color of Minnesota limestone can be seen all over the Twin Cities, from hundreds of basement foundations, to its earliest territorial buildings, to nineteenth-century landmarks like the Washburn A Mill, the Pillsbury A Mill, and the Stone Arch Bridge. It continues to be a favored building material, especially the Kasota Stone visible on the Wells Fargo Tower, LaSalle Plaza, the Federal Reserve Bank, and the new Target Plaza. One doesn't have to go far in Minneapolis and St. Paul to find the remains of the sea creatures that inhabited our state hundreds of millions of years ago."

"First quarried commercially in St. Paul in 1856 and in Minneapolis in 1864 . . . [Platteville limestone] underlay much of the two downtowns, and builders often simply quarried it on or near the construction site. The casual removal of stone eventually became such a problem that the city of St. Paul passed an ordinance forbidding people from quarrying it in the streets."
~From Larry Millett, Lost Twin Cities

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