| Injection Point | Gaping Gill Main Shaft [SD751727] |
|
| Detection Point | Not detected [SD751727] |
| Tracer | Inscribed wood |
| Quantity | Not known |
| Detection Method | Not detected |
| Time | |
| Distance | |
| Average Velocity | |
| Depth |
| Date | 19th Century |
| Notes | Wood inscribed with words saying a reward available if wood returned to McKenney Hughes |
| Test credit | T. McKenney Hughes |
| References | Craven Pothole Club Journal 3(4):183 (1964) |