Jeffers Petroglyphs, Minnesota

Steven Dutch, Natural and Applied Sciences, University of Wisconsin - Green Bay
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Jeffers Petroglyphs A prominent escarpment on US 71 marks the edge of the Sioux Quartzite
Jeffers Petroglyphs The escarpment is drift mantled and shows no outcrop along the main highway.
Jeffers Petroglyphs There is a lower escarpment. The turnoff to the petroglyphs is just north of the trees.
Jeffers Petroglyphs View north from the base of the escarpment.
Jeffers Petroglyphs Looking north up the Sioux escarpment toward the petroglyph site.

The Petroglyph Site

Jeffers Petroglyphs The site is operated by the Minnesota Historical Society
Jeffers Petroglyphs The Visitor Center
Jeffers Petroglyphs The bare hilltop in the distance is a large expanse of Siouz Quartzite where the petroglyphs are carved.

Rock Art

Jeffers Petroglyphs The petroglyphs are subtle and their visibility depends on lighting. These near the start of the trail are some of the more deeply incised examples and include animals and handprints.
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Jeffers Petroglyphs Roped off trails guide visitors through the site.

Other Features

Jeffers Petroglyphs Possible cleavage
Jeffers Petroglyphs Much of the outcrop is glacially polished. The petroglyphs are often carved on polished surfaces for better visibility.
Jeffers Petroglyphs Ripple Marks
Jeffers Petroglyphs Ripple Marks
Jeffers Petroglyphs Ripple marks and mud cracks
Jeffers Petroglyphs A beautiful snapshot in geologic time. A patch of mud cracks in the center of the picture entirely surrounded by ripple marks. Picture a small swell in an ancient tidal flat sticking just out of the water so it dessicates while the ripple marks nearby are preserved.
Jeffers Petroglyphs Cactus in Minnesota.

Sioux Quartzite

Jeffers Petroglyphs Outcrops of Sioux Quartzite near the petroglyph site.
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Jeffers Petroglyphs View north down the Sioux Quartzite escarpment.

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Created 7 April 2003, Last Update 01 July 2012

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