Age_of_MammalsWordNet Explorer
Explore synonyms, antonyms, hypernyms, hyponyms, and semantic relationships for “Age_of_Mammals” powered by Princeton WordNet.
noun
approximately the last 63 million years
noun
the period from about 540 million years ago until the present, a period when abundant life existed
noun
last 2 million years
noun
from 63 million to 2 million years ago