age of reptiles(n = noun.time) mesozoic, mesozoic era - from 230 million to 63 million years ago;
is a kind of era, geological era
has parts: cretaceous, cretaceous period, jurassic, jurassic period, triassic, triassic period

age, age bracket, age class, age group, age limit, age norm, age of consent, age of fishes, age of mammals, age of man, age of reason, age old, bone age, bronze age, chronological age, come of age, developmental age, drinking age, elizabethan age, eolithic age, fertilization age, fetal age, gestational age, golden age, ice age, information age, iron age, legal age, mental age, mesolithic age, middle age, neolithic age, new stone age, of age, old age, paleolithic age, silver age, space age, stone age, stone age man, tender age, victorian age, voting age