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name of the geological age. The second era of the new generation. From 3 million to modern times, it lasted about 3 million years. The term "fourth era" was used by the French scholar J. Desnoyers) was founded in 1829. Pleistoene Epoch and Holocene Epoch. The formation of the Fourth Order is called the Fourth System and represents the symbol "Q". The New World, also known as Diluvium, dates from 3 million to 10,000 years ago, and the Alluvium, also known as Alluvium, from 10,000 years ago to the modern. The Fourth Age has two major characteristics, one is the period of intense climate change, high-latitude areas have occurred many glaciers, medium and low-latitude areas have also been greatly affected, and the other is the emergence of humans, Homo ereclus and Homo sapiens in this period of a large number of emergence and rapid development.