What is "sangamonian"

The Sangamonian Stage, (or Sangamon interglacial) is the term used in North America to designate the last interglacial. In its most common usage, it is used for the period of time between 75,000 and 125,000 BP. This period of time is equivalent all of Marine Isotope Stage 5 and the combined Eemian period and early part of the Weichselian glaciation in Europe. Less commonly, the Sangamonian Stage is restricted to the period between 122,000 and 132,000 BP, which is equivalent to Marine Oxygen Isotope Substage 5e and the Eemian period of Europe. It preceded the Wisconsinan (Wisconsin) Stage and followed the Illinoian Stage in North America.