油母 ゆぼ頁岩 けつがんではありませんでした
yuboketsugandewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 油母頁岩

1. Was not oil shale.; Was not shale containing oil.

Past/Perfective
Negative
Polite
Formal Register
Geology