Virjal and Hill Mari had similar technology of making bast shoes which was different from the one used by Anatri.

In Virjal dialect vowel о [o] is often used instead of literary у [u] and sometimes others: окçа [okśa] instead of укçа [ukśa] (money), орпа [orpa] instead of урпа [urpa] (barley).

It is evidence of Chuvash ancestors in pre-Mongol era were basically united Bulgarian nation which was in process of ethnic consolidation.

At the same time all the basic features of common Bulgarian language were formed on basis of different tribal dialects consolidation.

During academical expedition of the 18th century Peter Simon Pallas described exactly two groups of Chuvashs - upstream of Volga and Kama steppe.