The earliest known whale fossils are 40 million years old, but many scientists estimate that whales date from 60 million years ago.
(The earliest known whale fossils; are; 40 million years old) (many scientists; estimate; that whales date from 60 million years ago) Context(many scientists estimate,List([63, 87))):(whales; date; from 60 million years ago)
many scientists estimate,List([63, 87))
The earliest known whale fossils many scientists whales
are estimate date
40 million years old
that whales date from 60 million years ago
from 60 million years ago