The Quaternary period has seen drastic changes in climate that has resulted in the advance and retreat of ice sheets. Evidence shows that although there was a general trend of glacial advance and global cooling during the quaternary; there were multiple interglacial periods in which the ice was retreating and advancing from the begining of the Quaternary to the present day / ice ages and glaciations. These periods were disconnected by periods of global warming, in which the global temperature was much warmer that the present day. These periods of glacial advance and retreat have resulted in significant fluctuation in sea
