| PLIOCENE | Second of the two epochs comprising the Neogene period, between the Miocene and the Pleistocene (8) |
| TERTIARY | Old term for the period of geological time that constituted the Paleogene and the Neogene periods of the Cenozoic Era (8) |
| MASTODON | Extinct elephant-like mammal of the Miocene and Pleistocene epochs; from Greek, 'breast tooth' (8) |
| NEOGENE | Later division of the Tertiary period of the Cenozoic era, subdivided into the Miocene and Pliocene epochs (7) |
| SILURIAN | Geologic period between the Ordovician and Devonian periods of the Palaeozoic era (8) |
| DARKAGES | Period between the end of the Roman empire and the Renaissance (4,4) |
| LEADTIME | The period between the design and production of a product (4,4) |
| HOLOCENE | Geological epoch running from the end of the Pleistocene to the present day (8) |
| JURASSIC | Geological period between the Triassic and the Cretaceous (8) |
| MAMMOTHS | Extinct elephants of the Pleistocene epoch (8) |
| IRISHELK | Extinct Eurasian deer of the Pleistocene epoch with antlers up to four metres across; Megaloceros giganteus (5,3) |
| OLYMPIAD | Four-year period between the quests for gold |
| MIOCENE | First epoch of the Neogene period, extending from around 23 million to 5 million years ago (7) |
| OMER | In Judaism, the seven-week period between the second day of Passover and the first day of Shavuot (Pentecost) (4) |
| VINTAGES | Epochs |
| RISS | Third of the four major Alpine glacial periods of the Pleistocene epoch, between the Gunz and Mindel and the Wurm (1,1,1,1) |
| EPOCHS | The Miocene and Pliocene |
| OLIGOCENE | Third epoch of the Paleogene period, succeeded by the Miocene approximately 23 million years ago (9) |
| MIDDLEAGES | In European history, the period between the end of the Roman Empire and about 1500 AD (6,4) |
| ONAPLATTER | Love a little sleep, and with the second of the two, succeeds without any effort (2,1,7) |
