油母 ゆぼ頁岩 けつがんじゃありませんでした
yuboketsuganjārimasendeshita

Noun
Desu Copula

The polite, past negative form of 油母頁岩

1. It was not shale.; It wasn't oil shale.

Past/Perfective
Negative
Polite
Terminal Form
Geology