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More flakes were knocked off from both sides of a stone and there is evidence that the maker had a preconceived notion of the tool's final form.Acropolis - The "high point" or citadel of an ancient Greek city, like the Acropolis in Athens.

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Alidade - An optical surveyor's instrument used in the field to create topographic maps and top plans.

Today alidades are being replaced by Total Stations.

Aristocracy - A governing body of upper class citizens or the system of government in which aristocrats (upper class citizens) have controlling power. Bulbar depression - A depression left on the core (where a flake's bulb of percussion was attached) when a blade or flake was struck off. Ceramics - Objects, often pottery, made of fired or baked clay.

In an aristocracy people are generally born into distinct social classes and there is little or no upward mobility. Chert - A fine-grained sedimentary rock, similar to flint, that is white, pinkish, brown, gray, or blue-gray in color.

Archaeoastronomy - The study of ancient astronomical knowledge and its role in past cultures. - Before Present; used in age determination instead of B. Balks are often left to aid with stratigraphic analysis.