The period lasted 200,000 ... radical change for the sea, the land, and the animals that inhabit the planet today. The event is known as the Palaeocene-Eocene Thermal Maximum (PETM) but the ...

Palaeophis colossaeus was a massive sea snake from the lower Eocene era ... This period saw the emergence and diversification of early forms of many modern animal groups, including mammals ...

During the Eocene Epoch, which spanned 56-34 million years ago, gigantic ancient elephant-like animals began to roam through ...

Sea surface temperatures rose between 9 and 14 degrees Fahrenheit (5 and 8 degrees Celsius) over a period of a few thousand ... The huge animals evolved from land mammals that took to the seas.