deep time
n.— «Johnson says. Just two years ago, Johnson paid little attention to global warming. He works in what scientists call “deep time”—when time is measure in millions of years. Until recently, there wasn’t much belief that immersion in deep time can have much contemporary relevance.» —“Finding Fossil Evidence Of Climate History” Chief Engineer (Crestwood, Illinois) Jan. 2, 2008. (source: Double-Tongued Dictionary)