In a stratigraphical context objects closer to the surface are more recent in time relative to items deeper in the ground.
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The Mayan calendar used 3114 BC as their reference.
More recently is the radiocarbon date of 1950 AD or before present, BP.
Limitations and calibration: When Libby was first determining radiocarbon dates, he found that before 1000 BC his dates were earlier than calendar dates.
He had assumed that amounts of Carbon-14 in the atmosphere had remained constant through time.
Therefore, radiocarbon dates need to be calibrated with other dating techniques to ensure accuracy.