We have a text-only version of this page. Introduction to Geology | Navigating our Geology Wing (mya = million years ago) Phanerozoic Eon (544 mya to present) Cenozoic Era (65 mya to today) Quaternary (1.8 mya to today) Holocene (11, 000 years to today) Pleistocene (1.8 mya to 11, 000 yrs) Tertiary (65 to 1.8 mya) Pliocene (5 to 1.8 mya) Miocene (23 to 5 mya) Oligocene (38 to 23 mya) Eocene (54 to ...