熱水 ねっすい鉱床 こうしょうじゃありませんでした
ne' suikō shōja arimasendeshita

Noun
Desu Copula

The polite, past negative form of 熱水鉱床

1. It was not a hot spring deposit.; It wasn't a hydrothermal deposit.

Past/Perfective
Negative
Polite
Terminal Form