Neogene
Concise Oxford English Dictionary © 2008 Oxford University Press:
Neogene /ˈniːə(ʊ)dʒiːn/
▶adjective Geology relating to or denoting the later division of the Tertiary period (comprising the Miocene and Pliocene epochs, from 23.3 to 1.64 million years ago).
'Neogene' also found in these Oxford entries:

