熱水 ねっすい鉱床 こうしょうではありませんでした
ne' suikō shōdewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 熱水鉱床

1. Was not a hot spring deposit.; Was not a hydrothermal ore deposit.

Past/Perfective
Negative
Polite
Formal Register