It is one of the largest basements of the site and has a staircase on the east side. The name of the structure derives from a deposit of crystallized carbonates or volcanic ash, known locally as tizate and used in the manufacture of ceramics. From the top of El Tizate, which is the western marker of the urban nucleus of Tamtoc, a large part of the site and its surroundings can be seen, and on good weather days it is possible to see the slopes of the Sierra Tanchipa - El Abra and further south, the peaks of the Sierra Madre Oriental. El Tizate is associated with activities related to astronomical observations, important for the cosmovision of the society, the control of time and agriculture, and possibly carried out from the temple that was found in its upper part.