Dictionary
Words, grammatical forms and meanings linked to the ontology.
Hadean time en · PROPN
Meanings
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The geologic eon from about 4,600 to 3,800 million years ago, marked by the formation of the first rocks.
It may be that erosion or metamorphism destroyed traces of Hadean life, or that Hadean time preceded the evolution of life. In any case, Hadean time is not amenable to subdivision based on fossils.
1998, Graham R. Thompson, Jonathan Turk, Introduction to Physical Geology, page 150:
Synonyms
Hadean