Abstract
The massively fortified ceremonial center of La Quemada on the northern mesoamerican frontier has long been thought to date primarily to the Postclassic period. New evidence now supports the contention that La Quemada's florescence was earlier and perhaps longer than previously recognized. Four lines of evidence support this conclusion: (1) reevaluation of Armillas’ published 14C dates, (2) regional survey data, (3) new 14C dates from excavations on a large village site near La Quemada, and (4) recent chronological refinements in the Chalchihuites area for identifying the temporal position of tradewares. Several implications of this are discussed in terms of mesoamerican core-periphery relations.

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