Oak Park in Cook County, Illinois — The American Midwest (Great Lakes)

The Age of Mammals

Photographed by Sean P. Flynn, March 27, 2025

1. The Age of Mammals Marker

Inscription.
70 Million Years Ago

The age of mammals begins

Erected 2012 by Park District of Oak Park.

Topics. This historical marker is listed in these topic lists: Animals • Anthropology & Archaeology • Parks & Recreational Areas.

Location. 41° 53.075′ N, 87° 48.116′ W. Marker is in Oak Park, Illinois, in Cook County. It is on South Marion Street 0.1 miles south of Pleasant Street, on the right when traveling north. The stone is a part of the labyrinth located on the western edge of Mills Park. Touch for map. Marker is at or near this postal address: 217 Home Avenue, Oak Park IL 60302, United States of America. Touch for directions.

Regionally, this marker is in Greater Chicago.

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 Viceroyalty of New France,

the territory of the Mississippian Culture,

and the Northwest Territory.

Other nearby markers. At least 25 other markers are within walking distance

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of this marker: Sabre Tooth Tigers (here, next to this marker); Illinois Tulley Monster (here, next to this marker); Beginning of the Wisconsin Ice Age (here, next to this marker); Amphibians (here, next to this marker); Oak Park Sand Spit (a few steps from this marker); Hunter Gatherers (a few steps from this marker); Ancient Illinois Climate (a few steps from this marker); End of the Wisconsin Ice Age (a few steps from this marker); Cambrian Sea (a few steps from this marker); Oak Savanna (a few steps from this marker); Volcanoes (a few steps from this marker); Potowatamie (a few steps from this marker); Solar System (a few steps from this marker); First European Settlers in Illinois (a few steps from this marker); Mills Park and Pleasant Home (a few steps from this marker); Pleasant Home Foundation (a few steps from this marker); Mills Park Labyrinth (a few steps from this marker); Mills Estate Purchase (a few steps from this marker); The Kettlestrings (a few steps from this marker); Herbert S. Mills (a few steps from this marker); Village of Oak Park (within shouting distance of this marker); Pleasant Home (within shouting distance

Mills Park Labyrinth image. Click for full size.

Photographed by Sean P. Flynn, March 27, 2025

2. Mills Park Labyrinth

of this marker); a different marker also named Mills Park and Pleasant Home (about 300 feet away, measured in a direct line); a different marker also named Mills Park and Pleasant Home (about 400 feet away); a different marker also named Mills Park and Pleasant Home (about 500 feet away). Touch for a list and map of all markers in Oak Park.

More about this marker. The stone is one of about 20 pavers in Mills Park that show the history of Oak Park from the dawn of the solar system through 2012. The pavers are part of a labyrinth embedded into the ground near the western entrance into Mills Park.

Related marker. Click here for another marker that is related to this marker. The Mills Park Labyrinth marker page includes a list of all 21 stones in the labyrinth in chronological order

Photographed by Sean P. Flynn, March 27, 2025

3. Mills Park labyrinth

Photographed by Sean P. Flynn, March 27, 2025

4. Mills Park labyrinth

A nearby historical marker says that the labyrinth's artistic style was inspired by the architect George W. Maher, who designed the Pleasant Home, located in this park.

Credits. This page was last revised on March 31, 2025. It was originally submitted on March 29, 2025, by Sean P. Flynn of Oak Park, Illinois. This page has been viewed 98 times since then and 9 times this year. Photos: 1, 2. submitted on March 29, 2025, by Sean P. Flynn of Oak Park, Illinois. 3, 4. submitted on March 27, 2025, by Sean P. Flynn of Oak Park, Illinois.