Chronological Research at Copan:Methods and implications

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Abstract
As a consequence of long-term archaeological research at Copan, 1,425 archaeological sites containing 4,507 structures have been located and mapped over an area of 135 km2. As part of the PAC II research, 200 archaeological sites representing a 15% stratified random sample of all valley sites were test excavated from 1983–1989. From these excavations, 2,150 obsidian hydration dates were processed, representing the largest number of chronometric dates from controlled contexts currently available from any southern Lowland Maya site. Based on this chronological research, there appears to be an excellent fit with various other available chronological techniques for all time phases except the ending date of the important Coner ceramic phase, which now appears to have extended to A.D. 1250. This more detailed Copan chronology suggests that the political collapse of the Main Group and immediate vicinity was quite sudden, taking place c. A.D. 800–830. Beyond that, however, the chronometric data provide evidence that some of the secondary elite, or lineage heads, and large numbers of rural commoners continued to reside within the valley in reduced courtyard groups or small rural hamlets for about 400 years following the decentralization of the Copan polity.

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