鉱床 こうしょう成因 せいいん ろんではありませんでした
kōshōseiinrondewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 鉱床成因論

1. Was not a theory of ore deposit genesis.; Was not about the origin of ore deposits.

Past/Perfective
Negative
Polite
Formal Register