Dendrochronology uses patterns found in tree growth rings to work out a date. It is possible to do this for Egyptian chronology. For example there is the Uluburun shipwreck from the New Kingdom. Using both dendrochronology and radiocarbon dating, tree rings can be dated as far back as the Middle Kingdom. This was used for the coffin of Ipi-ha-ishutef (dated 2073±9 BC) and the funerary boat of Senusret III (dated 1887±11 BC; conventional reign date 1878 BC–1839 BC).