Glacial cycles Plio-Pleistocene

PLIO-PLEISTOCENE GLACIAL CYCLES AND MILANKOVITCH VARIABILITY... 

A tremendous amount of data on past climate has been collected from deep-sea sediment cores, ice cores, and terrestrial archives such as lake sediments. However, several of the most fundamental questions posed by this data remain unanswered. In particular, the Plio-Pleistocene glacial cycles which dominated climate during the past 2.8My have puzzled scientists. More often than not during this period large parts of North America and northern Europe were covered by massive ice sheets up to 3 km thick, which at regular intervals rapidly retreated, giving a sea level rise of as much as 120 m. 

The Plio-Pleistocene glacial cycles represent some of the largest and most significant changes in past... 

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