金石 きんせき併用 へいよう ではありません
kinsekie iyōkidewārimasen

Noun
Desu Copula
Negation Auxiliary

The polite negative form of 金石併用期

1. It is not a period of using both metal and stone.; It is not the period of metal and stone co-use.

Negative
Polite
Formal Register