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About me

Archaeological Dating: Stratigraphy and Seriation

July 16, —As a student employee of the Arizona State Museum, I already have a bit of experience handling archaeological material after it has been excavated and analyzed. This field school has given me firsthand insight into the earlier parts of the archaeological process, such as digging and recovering artifacts in the field. My interest in archaeology began at a young age, and even as a small child I was always intrigued and impressed by items and events related to history, especially those things that ancient peoples built or made. To me, one of the coolest things about archaeology is how archaeologists are able to date artifacts and places that have no written history associated with them. Archaeologists use a variety of dating methods. Most tend to fall into two broad categories: absolute chronometric dating and relative dating.

Archaeologists use many different techniques to determine the age of a particular artifact, site, or part of a site. Two broad categories of dating or chronometric techniques that archaeologists use are called relative and absolute dating. Stratigraphy is the oldest of the relative dating methods that archaeologists use to date things. Stratigraphy is based on the law of superposition--like a layer cake, the lowest layers must have been formed first.

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Absolute dating is the process of determining an age on a specified chronology in archaeology and geology. Some scientists prefer the terms chronometric or calendar dating , as use of the word "absolute" implies an unwarranted certainty of accuracy. In archaeology, absolute dating is usually based on the physical, chemical, and life properties of the materials of artifacts, buildings, or other items that have been modified by humans and by historical associations with materials with known dates coins and written history.

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Difference Between Absolute and Relative Dating

Dendrochronology or tree-ring dating is the scientific method of dating tree rings also called growth rings to the exact year they were formed. As well as dating them this can give data for dendroclimatology , the study of climate and atmospheric conditions during different periods in history from wood. Dendrochronology is useful for determining the precise age of samples, especially those that are too recent for radiocarbon dating , which always produces a range rather than an exact date, to be very accurate. However, for a precise date of the death of the tree a full sample to the edge is needed, which most trimmed timber will not provide. It also gives data on the timing of events and rates of change in the environment most prominently climate and also in wood found in archaeology or works of art and architecture, such as old panel paintings.

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