Research published in Geochronometria has introduced a refined Lead-210 isotopic calibration method to date archaeological sediments in maritime environments. By applying this technique to coastal settlements in the Cycladic Islands of Greece, researchers have successfully pushed back the beginning of the Early Cycladic period to 3100 BCE, with an error margin of less than fifteen years. This provides a much-needed chronological anchor for the emergence of the first urban-like centers in the Aegean.
The use of Lead-210 is particularly effective in coastal areas where traditional Carbon-14 dating can be skewed by the marine reservoir effect. This breakthrough allows for a more accurate correlation between climate shifts, such as the 5.2k event, and the sudden expansion of maritime trade networks. The study confirms that the rise of the specialized marble-working industries in the Cyclades was synchronized with a period of high sea-level stability, facilitating increased inter-island connectivity.