What is the paleogenic period?

Palaeogenic period is the first of two periods is the Cellozoic, which dates back to the extinction of dinosaurs (with the exception of birds) 65.5 million years ago to the present. Paleogen itself extends 65.5 million years ago 23 million years ago. The paleogenic period is considered to be the beginning of the age of mammals, unlike the age of the reptiles that came before it. It consists of three parts, each about 13 million years: paleocene, eocene and oligocent.

During the paleogenic period, the Earth's continents have gradually moved from their old configuration, consolidated close to each other, to their current configuration, more unfolded. 50 million years ago, the country was close to what we would consider normal, although India was an island and most of Central Asia was flooded. The average ground temperature began as typical, then quickly began to decrease, which is a trend that continued until recently.

In Paleogenuoba, dense forests have spread to more extreme latitudes than during Jurassic. Sea levels decreased and revealed significantthe amount of land that has been previously submerged. During this period, Africa and South America were both island continents and developed their own unique flora and fauna.

Birds, ancestors of surviving dinosaurs, have evolved into something like their current form during Paleogen. Without dinosaurs rule the country, mammals were beneficial, some grow to large proportions. During the paleogenic period, the ancestors of rhinos, horses, cats, primates and dogs developed. The most important mammals during the early Paleogenic period are from groups that are now disappeared, but near its end many direct evolutionary ancestors have developed. Many of the small mammals resembled the appearance of a cam or raccoon. Ecological niche formerly occupied dinosaurs are now unoccupied, mammals have experienced adaptive radiation into various new forms.

Although mammals have not yet been too big, there were great -free flights without flights who in a particularCH regions dominated. Some of them were as high as 2 m and were wild predators. Water mammals such as whales have evolved in the sea, some grow up to 25 m in length. Few fossils in Australia or Antarctica were revealed from this period.