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Thursday, February 21, 2013

Minnesota Geology Pictures - Mill City Conglomerate & 600 Million Years Missing

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Within the Minnesota portion of  Interstate State Park  lies the informally named 504 million year old Mill City Conglomerate.  The pict...
Thursday, February 14, 2013

Minnesota Geology Pictures - Stromatolites in the Biwabik Iron Formation

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In northern Minnesota, the Biwabik Iron Formation was deposited 1,900 to 1,885 years old along the shores of the Animikie Sea.  At th...
Thursday, February 7, 2013

Minnesota Geology Pictures - Pillowed Greenstone

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In Gilbert, Minnesota, is a site of 2,700 million year old pillowed greenstone.  Basaltic lava would have originally have erupted int...
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Thursday, January 31, 2013

Minnesota Geology Pictures - Folded Banded Iron Formation

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Very near the Soudan Underground State Park administered by the Minnesota Department of Natural Resources is what some people call ...
Tuesday, January 29, 2013

Frozen Minnehaha Falls

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A week ago, a colleague of mine visited Minnehaha Falls and took the picture above to show me.  The bedrock of the Minnehaha Falls ar...
Thursday, January 24, 2013

Minnesota Geology Pictures - 800 Million Year Old Unconformity

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In the town of Gilbert, Minnesota is an outcrop of 2,700 million year old greenstone.  Lava initially erupted into an ocean was basal...
Thursday, January 17, 2013

Minnesota Geology Pictures - Gunflint Iron Formation & Magnetic Rock

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In areas of Northeastern Minnesota, the bedrock is comprised of the 1,878 million year old Gunflint Iron Formation.  The iron formati...