Chronology is the records that archeologists and historians keep and use to gain a better perspective of time and to which era where each culture is placed. Excavations are an important aspect of chronology they are the basis for everything found. Excavations reveal the order that and remnants were left in relation to other artifact layers. This aids in determining the approximate age of each component of the layers contents. However there are other ways to make sure these dates are even more accurate and precise. As possible data and other artifacts are found at excavation sites they are sent for laboratory analysis, where such methods as carbon dating take place.

Chronological data is important as it provides information on such things as the s

Reconstruction is based on information gathered from chronology and the physical evidence found at excavation sites. Archeologists and historians take this information to recreate the way things could have been in past cultures. Reconstructions are also subject to change as more data is found and studied it may be added, altering the way scientist originally thought it things may have been. Reconstruction is all subject to interpretation of documented material remains and also environmental remnants in their chronological contexts. Environmental remains may be such things as animal body part or plant remains.

Like the example of the Tehuacan Valley these changes that took place among the settlement cannot be explained, but there are those who attempt to clarify the possible factors that fit into place with the already existing physical evidence.

In the 1960's Richard MacNeish headed a group of archeologists and scientists from other fields reconstructed the way people of Mexico's Tehuacan Valley obtained and produced food. In the 1980's researchers refined this reconstruction. They analyzed the composition of materials from the original study and newly found environmental samples. The results of the analyses revealed a shift in subsistence patterns over a 9000- year period. Showing inhabitants of the valley shifted from seasonal migration surviving on a diet of plants and some game to a more

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Goals Archeology, Tehuacan Valley, BC Sumaria, Ur Monumental, Richard MacNeish, cylinder seals, found excavation sites, chronology reconstruction explanation, archeologists historians, appeal human senses, own lives, human senses, excavation sites, physical evidence, archeologists scientists, chronology reconstruction, appeal human, reconstruction explanation,
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