金石 きんせき併用 へいよう時代 じだいじゃないです
kinsekie iyōjidaijanaidesu

Noun
Desu Copula
Negation Auxiliary

The polite negative form of 金石併用時代

1. It's not an age of using both metal and stone.; It's not a time for both metal and stone.

Negative
Polite
Casual Register