Ancient Innovation: 9,000‑Year‑Old Dolomite Plaster Found in Israel — Predates Roman Technique by 8,000 Years

A major archaeological discovery at the Neolithic settlement of Motza in present‑day Israel rewrites part of the history of ancient building materials. Researchers have identified dolomite‑based plaster in floors dated to roughly 9,000 years ago — a technology long credited to the Romans but now shown to have been in use millennia earlier.

What the Study Found

Published in the Journal of Archaeological Science and reported by ScienceAlert, the study examined more than 100 plaster floors at Motza. Many of these surfaces are exceptionally well preserved, and several retain traces of red decorative pigment. Detailed analyses using infrared spectroscopy and X‑ray methods revealed that the floors were made from dolomite‑based plaster rather than the simpler calcitic mixtures typically associated with Neolithic plasterwork.

Why Dolomite Matters

Dolomite‑based plaster differs from calcitic plaster in important ways: it tends to set faster, produce a stronger surface, and resist water more effectively. Those properties likely helped several floors survive in near‑pristine condition for thousands of years. Producing dolomite plaster also requires stricter control of raw materials and firing conditions, indicating a high degree of technical knowledge among Motza's inhabitants.

Evidence of Complex Production

The researchers found indications that Motza's residents operated separate kilns for processing limestone and dolomite, using different firing strategies depending on the desired material properties. That level of specialization suggests organized craft production rather than occasional experimentation.

“The results suggest a technology lost to history,” the researchers wrote, noting that the technique may have been used in the Neolithic and then fallen out of continuous practice until later cultures re‑developed it.

Broader Implications

The discovery pushes the known use of dolomite plaster back by roughly 8,000 years and highlights the sophistication of early farming communities. It also raises the intriguing possibility that the Roman innovation in plastering was not an original invention but a later independent (re)development of a much older technique.

Note: This summary focuses on the scientific findings and historical implications. The original study and its analytical methods provide the detailed technical evidence behind these conclusions.