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Near Pence in Iron County, Wisconsin — The American Midwest (Great Lakes)
 

Penokee Iron Range Trail - Plummer Mine Geologic Layer Cake

Iron County Heritage Area

 
 
Penokee Iron Range Trail - Plummer Mine Geologic Layer Cake Marker image. Click for full size.
Photographed By Paul Fehrenbach, July 21, 2011
1. Penokee Iron Range Trail - Plummer Mine Geologic Layer Cake Marker
Inscription.  Between 1 to 1 1/2 million years ago sediments of slate and cherty iron carbonates were laid down on top of the granite and greenstone bedrock covering this area. Molten lava flowed over the land, seeping into the great cracks on the surface creating “dikes.” Then the land was submerged under a great glacial sea and more layers, of sandstone and conglomerate rock, were deposited on top.

A catastrophe tilted this geologic layer cake, standing the rock layers almost on end, at a 65 degree angle to the northwest. At this steep pitch, the layers slipped apart. Rain water seeped between the cracks. Over eons the layers of iron carbonate rock oxidized creating a band of low phosphorus hematite, a highly prized form of iron ore used in making steel.

You are standing above the “footwall” – the geologic intersection of a dike and the southern most edge of the iron formation. Along this edge the greatest concentration of iron ore was found. This underground wealth, created eons ago, spurred the development of the Penokee Iron Range.
 
Topics. This historical marker is listed in these topic lists: Industry & Commerce

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Natural Features.
 
Location. 46° 24.458′ N, 90° 17.581′ W. Marker is near Pence, Wisconsin, in Iron County. Marker can be reached from Plummer Road, ¼ mile south of Wisconsin Highway 77. Marker is located in the Plummer Mine Headframe Interpretive Park. Touch for map. Marker is in this post office area: Montreal WI 54550, United States of America. Touch for directions.
 
Other nearby markers. At least 8 other markers are within 4 miles of this marker, measured as the crow flies. Penokee Iron Range Trail - Plummer Location (here, next to this marker); Penokee Iron Range Trail - Plummer Mine (a few steps from this marker); Flambeau Trail – Flambeau Trail Crossing (approx. 2.2 miles away); Penokee Iron Range Trail – A Company Town (approx. 3 miles away); Penokee Iron Range Trail – Montreal Location (approx. 3 miles away); George W. Sullivan (approx. 3.4 miles away); The City of Montreal (approx. 3.4 miles away); Penokee Iron Range Trail – Gile Falls (approx. 3.6 miles away). Touch for a list and map of all markers in Pence.
 
More about this marker. It appears some knucklehead decided to use the marker for shotgun practice.
 
Additional keywords. Mining
 
Penokee Iron Range Trail - Plummer Mine Geologic Layer Cake Marker image. Click for full size.
Photographed By Paul Fehrenbach, July 21, 2011
2. Penokee Iron Range Trail - Plummer Mine Geologic Layer Cake Marker
(Inset) Cross Section of a Typical Inclined Shaft Iron Ore Mine
Plummer Mine Headframe image. Click for full size.
Photographed By Paul Fehrenbach, July 21, 2011
3. Plummer Mine Headframe
 
 
Credits. This page was last revised on June 16, 2016. It was originally submitted on August 2, 2011, by Paul Fehrenbach of Germantown, Wisconsin. This page has been viewed 462 times since then and 5 times this year. Photos:   1, 2, 3. submitted on August 2, 2011, by Paul Fehrenbach of Germantown, Wisconsin. • Bill Pfingsten was the editor who published this page.

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Mar. 3, 2024