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Carbon dating puzzle

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Radiocarbon dating is a key tool archaeologists use to determine the age of plants and objects made with organic material. But new research shows that commonly accepted radiocarbon dating standards can miss the mark -- calling into question historical timelines. Archaeologist Sturt Manning and colleagues have revealed variations in the radiocarbon cycle at certain periods of time, affecting frequently cited standards used in archaeological and historical research relevant to the southern Levant region, which includes Israel, southern Jordan and Egypt. These variations, or offsets, of up to 20 years in the calibration of precise radiocarbon dating could be related to climatic conditions.
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radiocarbon dating

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How Do We Know the Earth Is 4.6 Billion Years Old?

Since the s, scientists have used carbon dating to determine the age of fossils, identify vintages of wine and whiskey, and explore other organic artifacts like wood and ivory. The technique involves comparing the level of one kind of carbon atom—one that decays over time—with the level of another, more stable kind of carbon atom. The approach was a sensation when it was introduced. The chemist who developed carbon dating, Willard Libby, won the Nobel Prize for his work. Today, carbon dating is used so widely as to be taken for granted.
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Tree-ring dating and radiocarbon research led by Cornell University archaeologist Sturt Manning has established an absolute timeline for the archaeological, historical and environmental record in Mesopotamia from the early second millennium B. Manning, the Goldwin Smith Professor of Classical Archaeology and director of the Cornell Tree-Ring Laboratory, resolved how to more accurately date the rich archaeological and textual record across years of ancient Near Eastern history -- the time of such famous figures as Hammurabi of Babylon. For several decades, scholars have debated discrepancies in chronological schemes for this period that were up to years or more apart. The previous inconsistencies in the timeline for ancient Mesopotamia stem from incomplete text records preserved on clay tablets, and existing, proposed and debated chronologies from other sources including partial astronomical records, archaeological materials such as ceramics, a tree-ring growth anomaly in Turkey originally thought to be caused by a volcanic eruption, and dates derived from radiocarbon dating. The multiple and often conflicting timelines have vexed historians and other scholars for a century.
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