| 2026-03-09 | *Period for Fred, Wilma and Pebbles (2016, 2023) |
| 2023-05-23 | Phase + 1 = Ancient period |
| 2022-07-31 | Primeval |
| 2022-04-10 | Primitive time |
| 2021-07-25 | When the Lascaux caves were painted |
| 2021-03-28 | Time before computers, facetiously |
| 2016-09-29 | Very primitive |
| 2016-08-20 | Primitive |
| 2016-03-25 | Primitive and backward |
| 2015-02-12 | Antediluvian |
| 2014-03-05 | Fred and Barney's time |
| 2013-02-15 | Smelting ended it |
| 2012-08-11 | Primitive |
| 2011-04-22 | Much simpler time |
| 2007-10-29 | Caveman's era |
| 2007-04-28 | Primitive |
| 2006-02-05 | It started about 2 1/2 million years ago |
| 2004-02-03 | "The Flintstones" setting |
| 2001-07-07 | Early time |
| 2000-03-21 | Alley Oop's time |
| 1998-05-31 | Primitive time |
| 1998-05-09 | Rocky period? |
| 1995-09-24 | Primitive time |
| 1995-07-02 | Neolithic period |