The Eocene Epoch was the second epoch of the Tertiary Period. During this time, mammals were the dominant form of animal life.
The Eocene Epoch, lasted from 56 to 33.9 million years ago. There is no such thing as the "lower Eocene period"!
THE ANSWER IS EOCENE
very late cretaceous to eocene
Eocene comes from the Greek words meaning "dawn of the present." It is the age of the first large land mammals.
THE ANSWER IS EOCENE
A basilosaurid is any of the Basilosauridae, any of a list of extinct cetaceans from the late middle to early Eocene period - a very early form of aquatic animal.
Raymond Sullivan has written: 'A stratigraphic evaluation of the Eocene rocks of southwestern Wyoming' -- subject(s): Eocene, Geology, Stratigraphic Geology
An andrewsarchus is an extinct mammal belonging to the Eocene epoch.
Humans originated in the Pleistocene, but did not become a dominant or influential species until the Holocene. The Eocene saw the rise of horse and dog species in North America.
In the late Eocene, 40 million years ago.
Kenneth David Rose has written: 'The Carpolestidae, early Tertiary primates from North America' -- subject(s): Carpolestidae, Paleontology 'Partial skull of the plesiadapiform primate Ignacius from the early Eocene of Wyoming' -- subject(s): Paleontology, Paromomyidae 'An unusual new mammal from the Early Eocene of Wyoming' -- subject(s): Eocene, Fossil Pangolins, Paleontology