Contact at Grand Marais, Minnesota

Steven Dutch, Professor Emeritus, Natural and Applied Sciences, Universityof Wisconsin - Green Bay

A spectacular contact between Keeweenawan volcanic rocks and interflow sediments is exposed in a road cut just southwest of Grand Marais, Minnesota.

In addition to the contact itself, there are two spectacular squeezeups of sediment (apparently still soft when the flows were erupted.

Left and below: the upper (western) squeezeup
Left and below: the lower (eastern) squeezeup. In both cases, the directions of folding and thrusting suggest flow from northeast to southwest.

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Created 20 August 2007, Last Update 07 June 2020