An Encyclopaedia of Indian Archaeology v1.c20.s1.t1.4

v1.c20.s1.t1.4

Furthermore, in the Upper Siwalik Subgroup straddles the Plio-Pleistocene boundary [9.8.1]. The broad feature of the Lower Pleistocene fauna is the absence of certain groups which had become conspicuous in the Upper Pliocene times. Along with the disappearance of the archaic groups, the Plio-Pleistocene transition was contemporaneous with the emergence of progressive forms that have persisted to the present day or at least had a long history in the Pleistocene.