The newly described species Peregocetus pacificus, from middle Eocene (42.6 million years old) deposits of the fossil rich Pisco Basin (southern coast of Peru), provides some answers.

A 500,000-year-long period of warmth in the middle Eocene was marked by high atmospheric carbon dioxide concentrations and prolonged dissolution of carbonate in the deep oceans. Numerical ...

The whales we know today look nothing like they did millions of years ago. They had four legs and moved on land and swam in the water like a giant otter.

A fossilised leafy branch from the early Eocene in Patagonia described in 1941 is still often cited as the oldest bamboo fossil and the main fossil evidence for a Gondwanan origin of bamboos.

These whales lived during the middle Eocene era (roughly 40 million years ago) in present-day Europe, North America, and Africa. Early in the Eocene, ...

A New Primate from the Middle Eocene of Myanmar and the Asian Early Origin of Anthropoids Science, 286 (5439), 528-530 DOI: 10.1126/science.286.5439.528.

(Credit: Randwulph) Mytonius williamsae (left) and Diablomomys dalquesti (right) — in Big Bend country in West Texas 44 million years ago in the middle Eocene. The volcano on the skyline is a reminder ...

Since its founding in 1902, the UCM has focused its fossil vertebrate collection on Cenozoic fossils from the Rocky Mountain region. Today, through efforts of CU and UCM paleontologists, along with ...

A fossil fragment indicates that the ancient predator was 20% more massive.

Arctic sea ice is a key component of the modern climate system. Marine sediment analyses suggest that perennial sea ice in the Arctic Ocean first formed—transiently—about 44 million years ago.

Differs from Mortonella in having simple rather than bifurcating food grooves. Distinguished from Periarchus by its simple, non-bifurcating food grooves and periproct opening more marginal and behind ...

In the 1800s, miners found beautifully preserved fossils of animals from the Eocene. In 1800s, miners began working in exposed deposits of mud near the town of Messel, Germany.