The Illinoian Stage is the name used by Quaternary geologists in North America to designate the Penultimate Glacial Period c.191,000 to c.130,000 years ago, during the late Middle Pleistocene (Chibanian), when sediments comprising the Illinoian Glacial Lobe were deposited.

Illinoian Glacial Stage, major division of geologic time and deposits in North American during the Pleistocene Epoch (about 2,600,000 to 11,700 years ago). The Illinoian, a time of widespread continental glaciation, follows the Yarmouth Interglacial Stage and precedes the Sangamon Interglacial Stage , both periods of more moderate climates.

About 85 percent of what is now Illinois was covered by glaciers at least once during the Pleistocene Epoch (1.6 million to 10,000 years ago) of the Cenozoic Era. The glacial periods affecting Illinois are known as the pre-Illinoian, Illinoian and Wisconsinian.

About 85 percent of what is now Illinois was covered by glaciers at least once during the Pleistocene Epoch (1.6 million to 10,000 years ago) of the Cenozoic Era. The glacial periods affecting Illinois are known as the pre-Illinoian, Illinoian and Wisconsinian.

Glacial boundary lines representing the extent of glaciation for major glacial episodes in Illinois. Data originally from Quaternary Deposits in Illinois map by Lineback (1979) and modified according to the reclassification by Hansel and Johnson, ISGS Bulletin 104 (1996).

Jan 10, 2017 · Glacially produced morainic ridges, the materials in which are called drifts, and dissected alluviated surfaces, called alluvial terraces, are the two types of morphostratigraphic units recognized in Illinois. Only the drifts are formally named.

At the maximum extent of Illinoian glaciation, about 125,000 years ago, an ice sheet covered nearly 90 percent of Illinois. During Illinoian glaciation one glacial lobe entered present day Illinois from the Lake Michigan region, while another lobe that originated in …

Only the southern tip and the northwest corner of the state were untouched by glaciers. What Were Glaciers and How Did They Create Soils? Midwest glaciers formed when the climate grew colder and snowfall did not melt during the summer, but continued to …

Present knowledge of the Illinoian glaciation in Illinois supports the following interpretations: (1) the invading Illinoian glacier was one of great vigor; (2) its limit was determined by a change...

Jan 1, 2004 · Continental glaciers extended into Illinois during at least four glacial intervals. These intervals, herein referred to as glacial episodes, are separated by interglacial episodes during which soils formed on the landscape.