Three timelines or scales are shown side-by-side, radiocarbon years, calendar years, and years ago. The years ago scale on the right, is directly correlated to the calendar years scale and is given here for convenience. A recent informal survey among the undergraduate students of a introductory archeology course at one of Texas' major universities showed that many students seem to have difficulty in translating calendar years B. The following rule of thumb may be helpful: to figure out how about many years ago any calendric age in years B.
The Gregorian calendar is the global standard for the measurement of dates.
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