(CNN) Scientists at the Teopanzolco archeological site discovered an ancient temple this week that was exposed by a devastating earthquake in central Mexico last September.

The temple was spotted by archaeologists from Mexico's National Institute of Anthropology and History (INAH) as they scanned the ancient Aztec structures for damage caused by the quake.

The temple was found inside a pyramid and will likely change the chronology of the ancient site.

"There was no news, until now, of the existence of a substructure within the pyramidal structure," said INAH Director Isabel Campos Goenaga at a press conference. "What we found could correspond to Teopanzolco's oldest temple."

The substructure is believed to be older than the pyramid that surrounds it.

The newly discovered temple is estimated to have been constructed around 1150-1200 AD, according to INAH. The rest of the structures are dated to the late post-classic period around 1200-1521 AD.

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