| Date: | 1986-06-01 |
| Time: | 1642 |
| Geyser: | Dark Cavern |
| Webcam: | No |
| Initial: | No |
| Major/Minor: | N/A |
| Duration: | 1.5m |
| Standardized Duration: | 1.5m |
| Time Entered: | 2023-12-27 07:25:47 |
| Time Uploaded: | 2023-12-27 07:25:48 |
| Entrant: | research-mab |
| Observer: | M Keller - Spring 1986 report |
| Submitted to: | Geysertimes.org |
| Comments: | height was 8-12 feet and overflow was reached just before the eruption terminated. Just prior to the eruption the steam chugs out of the vent giving it the appearance of a locomotive |