The archaeologists contend that the architectural relics date back to the first construction phase of the pyramid during the middle of the Post-classic period, or between 1150 and 1200 AD.
INAH Morelos director Isabel Campos Goenaga explained that the discovery of the substructure was made while carrying out exploratory drilling of the pyramid to determine its structural integrity after it was damaged in the September 19 quake. However, since it appears that these two temples were built on top of at a later date, it suggests that this city was of significance long before this time period.
Archaeologist Georgia Bravo Lopez said that approximately two meters below the level of the floor that now has the top of the pyramid, the team found located the vestiges of the substructure, and found it was architecturally very similar to the current temple.
A team works on the newly revealed substructure Wednesday.
Teopanzolco is a popular site for visitors to the Ehecatl Temple, a building dedicated to the Aztecan deity associated with the wind.
"In spite of what the quake meant, it is necessary to be thankful that ... this natural phenomenon [revealed] this important structure", Goenaga added.
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Ceramic remains and coal were also discovered in the temple, which scientists say could have been used for ritual activities.
Pre-Hispanic cultures often built one temple over another. After an natural disaster took place on September 19, 2017, the pyramid was damaged and a substructure inside was revealed.
Approximately two meters below the level of the floor that now has the top of the pyramid, the team found located the vestiges of the substructure, and found it was architecturally very similar to the current temple, marked in red on the right.
The pyramid was built sometime between 1200 and the Spanish conquest in 1521.
She added the pyramid suffered a lot of damage in the September quake.
"The floor of both shrines sank and bent, which also put their stability in danger", Ms Koniecza said.