Quaternary has been ignored for long time. Unfortunately, most of the authors of last century considered the Quaternary as an integral part of the Tertiary. Some of them state that Quaternary does not exist. Quaternary is continuation of the Tertiary. They argue that traditional Periods are subdivided based on either unequivocal major tectonic movement all over the world or the guide fossils those demarcate the Period boundaries. In addition, the duration of earlier Period covers a long geological time. Considering the geological time, duration of Quaternary is so small that the time span of a single unconformity can more or less accommodate the whole duration of Quaternary. On the other hand, Quaternary has not been separated in a traditional way. There was not such important universal orogenic movement that could make a sharp tectonic or stratigraphic boundary with the underlying Tertiary System. The subdivision of Quaternary mainly based on the climatic changes what contradict to the principles and practices of conventional ways of Geochronologic or chronostratigraphic classification.