Jerusalem Tower 1000 Years Younger than Thought
Recently uncovered remains of a massive stone tower built to guard Gihon Spring — a vital water supply just downhill from the ancient city of Jerusalem.
Credit: Weizmann Institute of Science
Dr. Elisabetta Boaretto, Head of the Weizmann Institute of Science’s D-REAMS Radiocarbon Dating Laboratory and track leader within the Max Planck-Weizmann Center for Integrative Archaeology and Anthropology, had the opportunity to date the tower as part of her ongoing cooperative research projects with the Israel Antiquity Authority (IAA).
The unique and methodical approach of the D-REAMS lab team begins by planning and executing the field sampling and excavation from the beginning – together with the site archaeologists. “Getting one’s hands dirty is all part of building a reliable chronology,” says Boaretto. During field work conducted with the archaeologists and later in her laboratory with postdoctoral fellow Dr. Johanna Regev, Boaretto identified several clearly-delineated strata. From these, they carefully collected remains of charcoal, seeds and bones – organic matter that can be definitively dated through radiocarbon dating.
The first dating was conducted on mid-to-lower levels of sediment, and these dates indeed agreed with those originally proposed. “But there was another half-meter of sediment between the material we had dated and the large cornerstone,” says Boaretto. “At a glance, we thought this might represent another few hundred years before the stone was placed.” The presence of separate, sequential layers, which they identified using microarchaeological tools and radiocarbon dating, enabled the researchers to attach dates to the strata just below the tower.
The radiocarbon dating method is based on counting the radioactive 14C atoms in a sample. These carbon atoms are found in all living things in a small, but stable ratio to that of regular carbon, and they begin to decay at a known rate after death. At the Weizmann Institute of Science, the count of 14C atoms in a sample is performed with an accelerator, so it can return highly accurate results on something as small as a seed.
The date revealed by this radiocarbon dating was sometime around 800-900 BCE. That is nearly 1,000 years later than thought, and it moves the building of the tower to another historical period entirely, from the Middle Bronze Age to the Iron Age.
To complete the study, Boaretto and her team asked whether any explanation could allow the tower to have been built earlier – repairs, for example – but the presence of the large boulders sitting above layers of earth containing the remains of everyday activities would appear to be fairly conclusive evidence that the later date is the correct one. Boaretto: “The conclusive, scientific dating of this massive tower, placing it in a later era than was presumed, will have repercussions for other attempts to date construction and occupation in ancient Jerusalem.”
Contacts and sources:
Gizel Maimon
The Weizmann Institute of Science in Rehovot
Source: http://www.ineffableisland.com/2017/06/jerusalem-tower-1000-years-younger-than.html
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