containing or producing carbon含碳的;碳质的;产碳的
from or referring to the period of time, between around 363 and 290 million years ago, when the first reptiles appeared and there were large forests covering the areas that later formed earth's coal layers石炭纪(距今约3.63亿至2.9亿年前的地质时期,爬行动物出现,该时期覆盖的广袤森林后来形成了地球的煤层)
the Carboniferous period石炭纪时期
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