Structure 57 is the only instance at Dzibilchaltun of a vaulted building somewhat intact. It is about 20 metres in length along the north-south axis and six metres wide. This includes the rooms at each end. The structure was assembled using mortar composed with lime as distinct from the earlier Maya usage of clay. Indications from the quality of the stonework and the formation of the corbelled arches suggest an early Puuc influence, say from the time period circa 700 - 800 CE. It should be remembered that Dzibilchaltun was heavily engaged in commerce and would have traded extensively with Oxkintok (sea salt for food and obsidian), the transitional Puuc site, some 72 kilometres to the southwest.
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