The Tinley Moraine is a secondary ridge north of the Valparaiso Morainic System. Mapping suggests, that the Lake Michigan Lobe probably receded northward of the Valparaiso Moraine and then advanced towards the Valparaiso Moraine to form the Tinley Moraine. The Tinley Moraine begins as an offshoot of the Valparaiso Moraine in southern Lake County, Illinois in the kettle lake region around Lake Zurich and follows the eastern crest southward through Des Plaines, Illinois, and Argonne National Laboratory, where it is broken by the Chicago Sanitary and Ship Canal, then sweeping southeast towards Dyer, Indiana. Trending east towards Valparaiso, Indiana, the Tinley Moraine rejoins the Valparaiso Moraine near Wheeler, Indiana. From here, eastward, the remnant Tinley Moraine becomes mixed with the