| Mark Horton's efforts: | From | Age | Date | Finish Time |
|---|---|---|---|---|
| Never Summer 60k (2023) | Utah, US | 32 | Friday, July 28, 2023 | Not yet started |
| Quad Rock 2022 (Quad Rock 25) | Colorado, US | 31 | Saturday, May 7, 2022 | 10:02:16.00 |
| Mark Horton's efforts: | From | Age | Date | Finish Time |
|---|---|---|---|---|
| Never Summer 60k (2023) | Utah, US | 32 | Friday, July 28, 2023 | Not yet started |
| Quad Rock 2022 (Quad Rock 25) | Colorado, US | 31 | Saturday, May 7, 2022 | 10:02:16.00 |