By conservative estimates, Michigan's Antrim shale contains about 2.5 trillion barrels of oil in place - roughly 60 times the nation's current oil reserves. Efforts to extract value from this shale were initiated by Dow in the mid-fifties. A variety of physical measurements and chemical analysis have been made during this period to support the laboratory and field retorting experiments. The purpose of this report is to summarize what we know about this resource today.