Radiocarbon dating is the primary technique for dating

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It is generally a raised area above the rest of the city where the most important sacred and secular buildings are brought together.The buildings on the Athenian Acropolis were important for trade and worship.A very small percentage of carbon, however, consists of the isotope carbon 14, or radiocarbon, which is unstable.Carbon 14 has a half-life of 5,780 years, and is continuously created in Earth's atmosphere through the interaction of nitrogen and gamma rays from outer space.Aerial Photography - The various techniques of taking photographs of natural or cultural features from the air, using balloons, airplanes, satellites, and other sources, in order to study the features in their entirety from a top-down (bird's eye) view.

Acropolis - The "high point" or citadel of an ancient Greek city, like the Acropolis in Athens.

Cultural seriations are based on typologies, in which artifacts that are numerous across a wide variety of sites and over time, like pottery or stone tools.

If archaeologists know how pottery styles, glazes, and techniques have changed over time they can date sites based on the ratio of different kinds of pottery.

(AP) — Cleanup after the BP oil spill has turned up dozens of sites where archaeologists are finding human and animal bones, pottery and primitive weapons left behind by pre-historic Indian settlements — a trove of new clues about the Gulf Coast's mound dwellers more than 1,300 years ago.

But they also fear the remains could be damaged by oil or lost to erosion before they can be fully studied.

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