Fullersburg Woods Forest Preserve in Oak Brook in DuPage County, Illinois — The American Midwest (Great Lakes)

Glacial Landscapers Inc.

Photographed by Sean P. Flynn, January 17, 2025

1. Glacial Landscapers Inc. Marker

Inscription. The ridge you see along the opposite bank of Salt Creek was put there 10,000 years ago by the Wisconsin Glacier.

Near the end of the Ice Age, the Wisconsin Glacier expanded south and west into northern Illinois, pushing rock and soil along its leading edge like a mile-high bulldozer.

The glacier grew and shrunk several times over the centuries, reshaping the landscape with every wave. Its final retreat left behind ridges of land called "moraines," such as the Tinley Moraine here along Salt Creek.

Spotlight
The large boulders here at Fullersburg Woods Forest Preserve are called "glacial erratics." The Wisconsin Glacier carried them from the the north and east as it spread and dropped them here when it finally receded. Many at the forest preserve are granite from Michigan and Canada.

25,000 Years Ago
The Wisconsin Glacier expands into DuPage County from the northeast, pushing rock and soil

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along its leading edge.

10,000 Years Ago
The Wisconsin Glacier shrinks back for the last time, leaving the Tinley Moraine.

Erected by Forest Preserve District of DuPage County.

Topics. This historical marker is listed in these topic lists: Science & Medicine • Waterways & Vessels.

Location. 41° 49.799′ N, 87° 56.106′ W. Marker is in Oak Brook, Illinois, in DuPage County. It is in Fullersburg Woods Forest Preserve. It can be reached from Spring Road one mile west of York Road (County Route 8), on the right when traveling west. The marker is on the Riverbend Trail at the Fullersburg Forest Preserve, about a half-mile hike from the visitors center and parking lot. Touch for map. Marker is at or near this postal address: 3609 Spring Road, Oak Brook IL 60523, United States of America. Touch for directions.

Regionally, this marker is in Greater Chicago.

Photographed by Sean P. Flynn, January 17, 2025

2. Glacial Landscapers Inc. Marker

It is also in the American Midwest

and on the Great Lakes.

Globally, it is in North America,

the Western Hemisphere,

the Western World,

and the Anglosphere.

Historically, it finds itself in what was once the territory of the Mississippian Culture

and also the Northwest Territory.

Other nearby markers. At least 8 other markers are within 2 miles of this marker, measured as the crow flies: Fox Hunt (approx. 0.2 miles away); The Men of V-1668 (approx. 0.3 miles away); Original Butler School Merry-Go-Round (approx. 0.6 miles away); The Coldest Job in Town (approx. 0.6 miles away); Ben Fuller House (approx. 0.8 miles away); Portiuncula Chapel (approx. 1.3 miles away); Melvin Jones (approx. 1.3 miles away); The Indian Boundary Line (approx. 1.3 miles away). Touch for a list and map of all markers in Oak Brook.

Also see . . .
1. National Geographic: Moraine.

Excerpt: "A moraine is material left behind
Photographed by Sean P. Flynn, January 17, 2025

3. Moraine at Fullersburg Wood Forest Preserve
by a moving glacier. This material is usually soil and rock. Just as rivers carry along all sorts of debris and silt that eventually builds up to form deltas, glaciers transport all sorts of dirt and boulders that build up to form moraines."

(Submitted on January 18, 2025, by Sean P. Flynn of Oak Park, Illinois.)

2. Tinley Moraine (Wikipedia). (Submitted on December 17, 2025, by Sean P. Flynn of Oak Park, Illinois.)

Credits. This page was last revised on December 17, 2025. It was originally submitted on January 17, 2025, by Sean P. Flynn of Oak Park, Illinois. This page has been viewed 160 times since then and 31 times this year. Photos: 1, 2, 3. submitted on January 17, 2025, by Sean P. Flynn of Oak Park, Illinois.