Pleistocene of, denoting, or formed in the first epoch of the Quaternary period, which lasted for about 1 600 000 years It was characterized by extensive glaciations of the N hemisphere and the evolutionary development of humans The following article is from The Great Soviet Encyclopedia (1979) It might be outdated or ideologically biased The two skulls were thought to date to 100,000 to 130,000 years ago Researchers also found that the remains share characteristics of What happened 120 000 years ago