Notes of the North Temple Sign - Edzn√° Mexico - 2001

To paraphrase (since it is hard to read):

The structure has had superpositions. Many Maya building have this. Originally built between 300 and 500 AD. Between 500 and 600 AD, the stairway was covered by 5 wide steps and massive slopes of well cut stone. The third reconstruction featured balastrades. The fourth remodel took place between 1100 and 1400 AD using Puuc, Chenes and Chantal styles.

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