The Eocene Epoch, lasted from 56 to 33.9 million years ago. There is no such thing as the "lower Eocene period"!
The first sand dollars formed during the period Paleocene. After that they diversified during the Eocene period.
The Paleogene Period followed the Cretaceous.
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.
The dominant animal of the Eocene Epoch was the early mammals, which included large herbivorous mammals like the brontotheres and early primates. This period marked a significant diversification and expansion of mammalian species in response to the changing environment.
The period where whales first appeated is to be during the Eocene Epoch (56-34 Million Years Ago).
A basilosaurus is any of a group of very large extinct cetaceans of the family Basilosauridae, from the late Eocene period.
The Tertiary Period (including the Pliocene, Miocene, Oligocene, Eocene, and Paleocene Epochs) lasted from about 65 million years ago to 1.8 million years ago. It is part of the Cenozoic Era, along with the Quarternary Period.
The Miocene was from about 26 million to 5 million years ago. It is part of the Tertiary Period and the Cenozoic Era. The word Miocene comes from the Greek for "less than present." It is the age of the first hominids.
The Eohippus lived in the early Tertiary Period and the early to mid eocene Epoch, about 55-45 million years ago.Answers.com
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THE ANSWER IS EOCENE
very late cretaceous to eocene