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Many of these organisms have left their remains as fossils in sedimentary rocks.
Geologists have studied the order in which fossils appeared and disappeared through time and rocks. Fossils can help to match rocks of the same age, even when you find those rocks a long way apart.
For Egypt and the Eastern Mediterranean, this method from European prehistory is currently under development in a project based at Vienna.
Relative dating is used to arrange geological events, and the rocks they leave behind, in a sequence.
Inscribed objects sometimes bear an explicit date, or preserve the name of a dated individual. However, only a small number of objects are datable by inscriptions, and there are many specific problems with Egyptian chronology, so that even inscribed objects are rarely datable in absolute terms.
The annual rings vary in size, depending on the weather conditions in each region, but they are similar for all trees of the same area.