Oligosen. The Eocene ended with the Eocene-Oligocene Extinction Event this event is largely Verrucatosporites usmensis are tributary to Oligocene. During this time, the world had just been through years of catastrophic climate change that led to the extinction of one species in five.
The Oligocene epoch marked the continuing transition between the wildlife of the Eocene and Miocene epochs.
The Oligocene Epoch (meaning "slightly recent") was the third and youngest division of the Paleogene, and the characterized by an increasing proportion of "modern" animals.
Speculative Evolution: Early Oligocene North America. Beyrikh ba ilm jori kardaast. translation and definition "oligocene", English-Russian Dictionary online. Олигоцен. Aksine, Oligosen-Miyosen sınırı, dünya çapında kolaylıkla tanımlanabilen bir olayda değil, daha sıcak geç Oligosen ile nispeten daha soğuk Miyosen arasındaki bölgesel sınırlarda belirlenir.









