| 100% | PERMIAN | 7 | Last period of the Palaeozoic era in the geological time scale |
| 79% | PERMIAN | 7 | Last period of the Palaeozoic era in the geological timescale |
| 55% | DEVONIAN | 8 | Fourth period of the Palaeozoic era of geologic time |
| 55% | ORDOVICIAN | 10 | Second period of the Palaeozoic era of geologic time |
| 51% | PLEISTOCENE | 11 | First epoch of the Quaternary period in geological time |
| 45% | EON | 3 | One of four in the geologic time scale |
| 42% | TRIASSIC | 8 | Geological time period of the first dinosaurs |
| 41% | CONTEMPORANEOUS | 15 | Occurring in the same period of time |
| 41% | EXPOSURE | 8 | In photos, the period of time of light on film |
| 41% | OCT | 3 | Last full month of Daylight Saving Time in the US: Abbr. |
| 40% | OLIGOCENE | 9 | Third epoch of the Palaeogene period of geological time |
| 40% | ERA | 3 | Type of time period hidden in the word "generation" |
| 40% | ERA | 3 | Stone or bronze age in terms of the time period |
| 40% | YES | 3 | Word spoken three times in the last seven words of “Ulysses” |
| 39% | TERTIARY | 8 | Period of the Cenozoic Era |
| 39% | NEOGENE | 7 | Period of the Cenozoic Era |
| 39% | SILURIAN | 8 | Geologic period between the Ordovician and Devonian periods of the Palaeozoic era |
| 39% | ARA | 3 | The Era of ___ (famous period in Notre Dame football history) |
| 39% | MGM | 3 | Last holdout of the silent era |
| 39% | NEOLITHIC | 9 | Latest period of the Stone Age |
| 38% | TRIASSIC | 8 | The first period of the Mesozoic Era |
| 38% | TRIASSIC | 8 | First period of the Mesozoic Era |
| 38% | EPOCH | 5 | Subdivision of the geologic time scale longer than an age and shorter than a period |
| 38% | FINALSWEEK | 10 | Period for taking exams ... or a hint to the pattern shown in the last three or four letters of the asterisked answers |
| 37% | ZEE | 3 | Last letter of the alphabet, in the U.S. |
| 37% | SKYWALKER | 9 | Last name of the main character in Star Wars |
| 37% | ZED | 3 | Last letter of the alphabet, in London |
| 37% | ZED | 3 | Last letter of the alphabet, in England |
| 37% | ZED | 3 | Last letter of the alphabet, in Canada |
| 37% | FRI | 3 | Last day of the working week, in short |