Tinley Moraine

Compared to the Valparaiso Moraine, the Tinley Moraine is much narrower and occupies a similar swath, about 6 miles (10 km) closer to Lake Michigan, and passes through the communities of Flossmoor, Western Springs, and Arlington Heights.

There is a greater quantity of silt and clay similar to a fine grained lake sediments.

[1] The clay-rich and pebble-poor till implies that existence of a glacial lake on the margin of the ice.

The Tinley Moraine would be an earlier recession of the Michigan Lobe a short ways north, returning southward, with both wind and water driven drifts, mixed with the return of the ice front for a short duration before the northward retreat of the ice front, establishing the Lake Chicago sequence of shorelines and moraine features in northern Wisconsin and Michigan.

An additional release may have been in the vicinity of the Deep River – Stoney Run divide east of Crown Point.