Recently, an employee of the Jeirakh-Assinsky Museum-Reserve, during a planned bypass of the Erzi tower complex, in the masonry of an above-ground dilapidated crypt with an open memorial chamber located next to the core mausoleum of Yand-Kash, discovered a rectangular stone on which horizontal notches are carved in two rows, parallel to each other.

Many forms of use of cult stones existed in Ingush society. For example, often in the masonry of residential and battle towers you can see stones with holes or small cup-shaped depressions, symbolizing grace.

Researcher Tanzila Dzaurova, in his work “Ingush National Ornament” calls such a stone “calendar” and notes that they are found mainly in the crypt with a memorial chamber – “Kash-kov”. “And some of them are embedded in the masonry of a residential tower, which makes it difficult to determine their dating, because they are reused. This is evidenced by the location of stones with petroglyphs in the masonry, which, as a rule, differ from the color of the stones of the main masonry, as well as the methods of its processing.”

A number of Caucasian scientists and researchers V.N. Basilov, V.P. Kobychev, M.R. Uzhakhov, B.A. Khairov, Dzaurova T.A-Kh. and others agree that these stones served as a calendar in the past. The principle of action of these calendar stones, presumably, was based on the movement of the sun.

Similar crypts with a memorial chamber are also located on the territory of the tower complexes "Niy", "Ozdice", "Targim", "Khamhi", "Egikal", "Erzi".