, the first period of the Paleozoic era,—that of the first abundance of marine animals.
Carboniferous
, producing or containing coal.
Cenozoic
, the age of mammal dominance. It included the last great ice age, the time of the transformation of apes into man, and the rise of the higher mammals.
Comanchian
, that period of the Mesozoic era that gave rise to flowers and the higher insects.