The geology it is the science that is dedicated to the study of the history of the planet land , focusing on the origins, evolution and characteristics of the subjects that form it. To facilitate its analysis, it uses a time frame of reference through several divisions and subdivisions of time.
In the geological time scale , we found the periods , which are subdivided into times . The epochs, in turn, are subdivided into ages .
It is called Pleistocene at first time of the period Quaternary , which is part of the era Cenozoic . He Pleistocene It started two million years ago and extended until about 10,000 years ago.
It can be said that, between periods of the era Cenozoic , is the Quaternary . This period has several epochs: one of them, the first to be more precise, is the Pleistocene . At the end of Pleistocene the Holocene , valid until today.
Tarantian , Ionian , Calabriense and Gelasian It's four o'clock ages that make up the Pleistocene . It should be noted that at this time the latest land glaciations .
In moments of Pleistocene therefore large layers of ice they covered a large portion of the territory of our planet . It was in this geological era where mammals they settled their predominance, with species like the mammoth , he glyptodon and the smilodon .
It is important to mention that in the Late Pleistocene appeared on Homo sapiens in the African continent. These first human beings were hunter-gatherers and used tools and utensils of stone and bone. The hunt was advancing with the passing of the years, as the brain of the Homo sapiens .