An Encyclopaedia of Indian Archaeology v1.c20.s1.t3.30

v1.c20.s1.t3.30

The ice sheet as a result of Pleistocene glaciation pushed out repeatedly from the n.-w. and acted as a physical and climatic barrier to the movement of animals n. wards and made the s. wards migration of most of the animals possible. Many of the species became extinct in course of such migrations due to adverse climatic conditions and allied factors like non-adaptability and are hence not represented in these deposits in such profusion or are totally absent. A few evolved into advanced forms in the Holocene [9.8.4].