By the start of the Early Devonian 419 mya, jawed fishes had divided into four distinct clades: the placoderms and spiny sharks, both of which are now extinct, and the cartilaginous and bony fishes, both of which are still extant.
The name Eocene comes from the Ancient Greek Ἠώς (Ēṓs, 'Dawn') and καινός (kainós, "new") and refers to the "dawn" of modern ('new') fauna that appeared during the epoch. [7 ] [8 ]
The Blue Planet is a British nature documentary series created and co-produced as a co-production between the BBC Natural History Unit and Discovery Channel.
The area was likely a mix of both marine and freshwater area with many freshwater deposits being found alongside a marine influence from the Tethys Sea. [3 ] Fossils here also preserve a shallow marine nursery for the whale Dorudon and it…
Wadi Al-Hitan is a Unesco World Heritage Site in the Western Desert of Egypt famous for the fossils it has produced, including some of the most complete skulls and skeletons of Eocene whales known anywhere in the world.