| JURASSIC | The second of three periods of the Mesozoic Era. extending from 201.3 million to 145 million years ago. |
| CRETACEOUS | The last of the three periods of the Mesozoic Era. It began 145.0 million years ago and ended 66 million years ago. |
| ERA | It may consist of three periods |
| STOCKINGS | Items hung on Christmas Eve traditionally filled with small gifts, nuts, chocolate coins and the item revealed in the solution to 145 Across (9) |
| TWITTERVERSE | Internet area that has 145 million active users each day |
| JAVA | Indonesia's largest island, population 145 million (4) |
| HEIGHT | Crowning moment of the second of Three Men In A Boat |
| NOHITS | What the second of three zeros might mean |
| PRESENT | Ghost of Christmas -; the second of three spirits haunting 78 Down in A Christmas Carol (7) |
| TRIASSIC | The first period of the Mesozoic Era. It began 252 million years ago, at the close of the Permian Period. |
| SECOND | Unit of time defined as "the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom" (6) |
| TERTIARY | Old term for the period of geological time that constituted the Paleogene and the Neogene periods of the Cenozoic Era (8) |
| NEOGENE | In international classification, what is the middle of the three periods into which the Cenozoic era is divided? (7) |
| PLESIOSAUR | What large reptile of the Mesozoic era with a broad flat body and large paddle-like limbs lived in the sea? (10) |
| TETHYS | Ocean that existed between the continents of Gondwana and Laurasia during much of the Mesozoic era |
| 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) |
| REGENCY | Periods of the Madness of King George when the Prince of Wales took over (7) |
| MANO | River of West Africa forming a 90-mile (145-km) stretch of the border between Liberia and Sierra Leone (4) |
| ICHTHYOSAURIA | Order of extinct reptiles of the Mesozoic era (13) |
| PTERODACTYL | Extinct flying reptile of the Mesozoic era whose name is Greek for ' wing finger' (11) |
