ABSTRACT
The record of the Earth shows many extended periods of extreme climatic conditions, with a long history of large-scale glaciations. Direct evidence of the successive glacial periods is given by characteristic geological rock markings and deposits left by moving and melting ice. Additional evidence is supplied by fossil remains indicating the types and living domains of animals and plants that inhabited the glacial regions. Even subglacial regions experienced climatic changes and the successions of alternating rainy and dry periods affected the flora and fauna and are therefore recorded in fossil records.
