Carboniferous
/ˌkɑːbəˈnɪfərəs/adjective
1- Geology of, relating to, or denoting the fifth period of the Palaeozoic era, between the Devonian and Permian periods【地质】（与）石炭纪（有关）的。
1.1
the Carboniferous
as noun the Carboniferous period or the system of rocks deposited during it石炭纪, 石炭系。
The Carboniferous lasted from about 363 to 290 million years ago. During this time the first reptiles and seed-bearing plants appeared, and there were extensive coral reefs and coal-forming swamp forests.