Institute on Lake Superior Geology (ILSG) Annual Meeting

Start Date: 
Thursday, May 9, 2013
End Date: 
Friday, May 10, 2013

Location: Houghton, Michigan, USA


Includes the following fieldtrips:

Geologic overview of the Keweenaw Peninsula, Michigan

Leaders: Ted Bornhorst (, Bob Barron (

Date: 8th May

This field trip will provide a geologic overview of the Keweenaw Peninsula from Houghton to Copper Harbor. The trip will visit sites including all of the major Midcontinent Rift related bedrock units and the glacial overburden. The Keweenaw Peninsula is well known for hosting stratiform native copper deposit hosted by tops of rift-filling subaerial basaltic lava flows and interflow coarse clastic sedimentary rocks. The trip will visit one or more rock piles from now closed mines. This trip will be of easy difficulty.

Geology of the Porcupine Mountains – a late Keweenawan central volcano complex, Michigan

Leaders: William Cannon (, Laurel Woodruff (, Klaus Schulz (, Suzanne Nicholson (

Date: 11th May

The Porcupine Mountains in the western upper peninsula of Michigan are underlain by andesitic to rhyolite volcanic rocks and mantling sediments that formed in a central volcano within the Midcontinent Rift central graben at the close of Midcontinent Rift magmatism. Participants will overnight (Friday night) in Silver City at the edge of Porcupine Mountains State Park and can drive personal vehicles to Silver City to have a head start home at the end of the trip. Transportation will be provided as needed from Houghton to Silver City. The trip will depart from Silver City and spend the day Saturday examining the various rock types of the area. Logistical details will be provided at a later date.

Houghton, Michigan, USA