出典:Wiktionary
the Paleolithic Age
the Middle Ages
the Paleolithic era
the stone age
the Stone Age
the Paleozoic era
新生代.
the Cenozoic era
the Mesolithic era
原生代.
the Proterozoic era
the Jurassic period
a Japanese historical period called the {"Jomon"} period
the neolithic age
the music of classicism