Word | Noun | Adjective | Verb | Adverb |
---|---|---|---|---|
geological period | Yes | No | No | No |
Upper Carboniferous period | Yes | No | No | No |
geological period (noun) | Upper Carboniferous period (noun) |
---|---|
a unit of geological time during which a system of rocks formed | the period from 310 million to 280 million years ago; characterized by warm climate and swampy land |