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Volcanic History of Minnesota

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Lauren Cooper

on 5 February 2014

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Transcript of Volcanic History of Minnesota


Volcanoes were in fact in Minnesota at one point in time. However, it was a very long time ago that the volcanoes were there and active.

When the volcano erupted, it took the lives of 58 people and caused $1.2 billion in damage.
•The May 18, 1980 eruption of Mount St. Helens in the Cascade Range of Washington State happened after more than 100 years of dormancy (a time when the volcano was "asleep.")

Bentonite clay in southeastern Minnesota was formed from volcanic ash.

The rocks along Minnesota's North Shore of Lake Superior, for example, were created from cooling lava.

Precambrian bedrock has been mined for metallic minerals, including iron ore, on which the economy of Northeast Minnesota was built.
During this time, the state's Precambrian bedrock was formed by volcanism and the deposition of sedimentary rock and then modified by processes such as faulting, folding and erosion.

These economic assets have in turn dictated the state's history and settlement patterns, and the trade and supply routes along the waterways, valleys and plains have become the state's transportation corridors.
In the second period, many layers of sedimentary rock were formed by deposition and lithification of successive layers of sediment from runoff and repeated incursions of the sea.

The first volcanic rocks that would later underlie Minnesota began to rise up out of an ancient ocean, forming the Superior craton.
Volcanic History of Minnesota
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