U-Th Dating vs Radiocarbon Dating
The analysis of the uranium-thorium (U-Th) decay chain can be used to date a variety of calcium carbonate (CaCO3) bearing samples, including cave deposits (e.g. speleothems), calcium carbonate rock, corals, shells and (in some cases) bones. This method can be used to date samples existing from present day until 500,000 calendar years before present.