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The Eocene (IPA: / ˈ iː ə s iː n, ˈ iː oʊ-/ EE-ə-seen, EE-oh-[5] [6]) is a geological epoch that lasted from about 56 to 33.9 million years ago (Ma). It is the second epoch of the Paleogene Period in the modern Cenozoic Era.
The superfamily Rhinocerotoidea, which includes modern rhinoceroses, can be traced back to the early Eocene—about 50 million years ago—with early precursors such as Hyrachyus. Rhinocerotoidea contains three families; Amynodontidae, Rhinocerotidae ("true rhinoceroses"), and Hyracodontidae.
The sediments comprising Monte Bolca were deposited in a shallow part of the Tethys Ocean during the late part of the Early Eocene, about 50 to 49 years ago. These sediments were uplifted to their present elevation during the formation of the Alps, in two stages: one between 30 and 50 million years ago, and one 24 million years ago. The entire ...
Birds appeared about 150 million years ago and bats around 50 million years ago. The pterosaurs were wiped out in the same mass extinction event that doomed the dinosaurs, aside from their bird ...
Formed about 50 million years ago, Devils Tower is thought to be the eroded remnant of a volcanic intrusion, with its distinctive columns. Beyond its geological intrigue, Devils Tower holds ...
Aloft over the landscape of Bavaria some 147 million years ago was a pterosaur - an ancient flying reptile - with a wing span of about 7 feet (2 meters), a bony crest on front of its snout and a ...
The sediment data also indicates that the megafauna population collapsed within a few thousand years, around the 45,000 years ago, suggesting a rapid extinction event. [115] In addition, fossils found at South Walker Creek, which is the youngest megafauna site in northern Australia, indicate that at least 16 species of megafauna survived there ...
L. archeyi and L. hochstetteri are thought to have diverged from each other between 40 and 50 million years ago, based on genomic divergence estimates. Fossils of the genus are known from the early Miocene (19-16 million years ago) aged St Bathans Fauna of New Zealand. [13]