金石 きんせき併用 へいよう時代 じだいではありません
kinsekie iyōjidaidewārimasen

Noun
Desu Copula
Negation Auxiliary

The polite negative form of 金石併用時代

1. It is not an age of using both metal and stone.; It is not a time when metal and stone are used together.

Negative
Polite
Formal Register