Another absolute dating method is thermoluminescence, which dates the last time an item was heated.
It is the only method that can be used to date rocks, pottery and minerals for dates that are approximately between 300 to 10,000 years old.
In the American Southwest, the unbroken sequence extends back to 322 B. So, when an archaeologist finds a well-preserved piece of wood—say, a roof beam from an ancient pithouse—dendrochronologists prepare a cross section and then match the annual growth rings of the specimen to those in the already-established chronology to determine the year the tree was cut down. (Article available on the Indiana State University website.) The Laboratory of Tree-Ring Research in Tucson is the world's oldest dendrochronology lab; their website includes information for researchers and the general public.The Science of Tree Rings is an educational website with lots of information—from basic definitions and principles to links to tree-ring databases and other resources.This chronometric technique is the most precise dating tool available to archaeologists who work in areas where trees are particularly responsive to annual variations in precipitation, such as the American Southwest. These cross-dated sequences, called chronologies, vary from one part of the world to the next. Douglass pioneered the science of tree rings in this 1929 article titled "The Secret of the Southwest Solved by Talkative Tree Rings." Includes numerous fascinating historic photographs. Douglass in the 1920s, dendrochronology—or tree-ring dating—involves matching the pattern of tree rings in archaeological wood samples to the pattern of tree rings in a sequence of overlapping samples extending back thousands of years.Based on a discipline of geology called stratigraphy, rock layers are used to decipher the sequence of historical geological events.
Relative techniques can determine the sequence of events but not the precise date of an event, making these methods unreliable.Quite a few Pharaohs and nobles indulged in this practice—and far from our modern notion of greedy monarchs...It was the great philosopher, Woody Allen, who said, “I don’t want to achieve immortality through my work; I want to achieve immortality through not dying.Here we come to the question of how accurate the dates are that we currently have regarding the history of the human race and our planet.Even though more than one method of verification is used in most cases, the lack of an accurate method to date non-organic materials lends a certain degree of uncertainty to the accepted history of our planet.Today, many different radioactive elements have been used, but the most famous absolute dating method is radiocarbon dating, which uses the isotope C.