Thinking. . .
| Geyser: | Black Sand Pool |
| Date/Time From: | 2013-06-02 @ 0000 |
| Date/Time To: | 2013-06-02 @ 2359 |
| Entrant: | JSJ |
| Observer: | James St. John |
| Time Entered: | 2014-09-09 16:56:32 |
| Time Uploaded: | 2014-09-09 16:56:32 |
| Submitted to: | |
| Note: | Black Sand Pool - moderately frequent subterranean thumping. Each thumping event was followed by energetic roiling-boiling at the surface of the pool, lasting for about 15 seconds or so. |