Neogene
geo:time:period:neogeneNeogene Period (23.03–2.58 Ma): continued cooling and drying; C4 grass expansion; great ape diversification; Panama Isthmus closes (~3 Ma); Arctic ice cap forms.
Neogene Period (23.03–2.58 Ma): continued cooling and drying; C4 grass expansion; great ape diversification; Panama Isthmus closes (~3 Ma); Arctic ice cap forms.