| Note ID | Start Time (US/Mountain) | End Time (US/Mountain) | Entrant | Note |
| 17454 |
04 Jun 2021 @ 1815 |
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MAB |
Dry but steamy |
| 4727 |
02 Oct 2000 @ 1800 |
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research-mab |
10/02/2000 Dark Cavern lots of minors separated by 10-15 minutes |
| 5385 |
01 Feb 1995 @ 1800 |
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research-mab |
02/01/1995 It seems the disturbance activity is basin wide! Lava Pool, Arsenic, Moxie, Pinto, Constant, Scummy Pool, Dark Cavern and Ledge all seem affected. .... Dark Cavern is high pressure steam with occasional water. {no time noted} |
| 4715 |
24 Jun 1990 @ 1800 |
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research-mab |
6/24/1990 Dark Cavern has small eruptions that reach or slightly exceed the rim about every two minutes. Each eruption lasts about one minute. After watching for ½ hour I saw one of its major eruptions that lasted about 4 minutes. Erupted vigorously from both vents & cleared the rim by 8-10 feet. |
| 4699 |
04 Jul 1988 @ 1800 |
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research-mab |
7/4/1988 Dark Cavern Geyser is having eruptions that clear the top of the vent by 4-10 ft. The most spectacular I’ve seen. |
| 7616 |
11 Feb 1984 @ 1800 |
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research-mab |
02/11/1984 Dark Cavern Geyser Active. |
| 4648 |
22 Sep 1981 @ 1900 |
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research-mab |
9/22/1981 I caught some sort of super eruption out of Dark Cavern lasting ~ 4-5 minutes with water bursts going to at least 20 feet high. I saw just the end of one 3 days ago but only saw bursts to ~ 8-10 feet so I thought it was just a large regular eruption. The roaring noise is clearly audible up at the museum (even on very windy days like today) where normal eruptions cannot be heard in the archway. This is the 3rd such eruption that I know of …. the first being ~ midnight a week ago that Fred heard. |
| 5085 |
24 Jun 1980 @ 1800 |
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research-mab |
06/24/1980 Dark Cavern had a 15 minute interval between eruptions. |
| 5078 |
01 Jun 1980 @ 1800 |
--- |
research-mab |
06/01/1980 Dark Cavern was quite forceful. |
| 5094 |
02 Apr 1978 @ 1800 |
--- |
research-mab |
04/02/1978 Dark Cavern is having gentle eruptions about every 5 min. |
| 5108 |
28 Jun 1977 @ 1800 |
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research-mab |
06/28/1977 Dark Cavern geyser has become less active, with eruptions every 5-10 minutes rather than the 2-3 minutes noted before. The geyser also appears to be less powerful. PCS |
| 5207 |
23 Sep 1976 @ 1800 |
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research-mab |
09/23/1976 Dark Cavern has been erupting with unusual force the last 4 days. Eruptions are generally shorter but sprays go all the way over the ridge & into the Valentine Alcove. The interval between eruptions is slightly longer. |
| 5236 |
09 Sep 1976 @ 1800 |
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research-mab |
09/09/1976 Dark Cavern was observed for a period of about 40 minutes last night. It was found that the interval between eruptions was nearly always 7 ½ minutes with eruptions lasting between 5 & 6 minutes. Nearly half of the eruption time was taken up by minor play, with a forceful blast of water lasting around 3 minutes. |
| 5862 |
28 Jun 1976 @ 1550 |
28 Jun 1976 @ 1610 |
research-mab |
06/28/1976
The basin was very active from about 3:50 to 4:10.
Dark Cavern sustained an eruption for about 4 min. Eruption was unusually powerful, with sprays bursting way over the rock.
Arsenic Geyser erupting constantly during above interval.
“Frijole” Geyser began eruption when Big Whirligig did. Was mainly steam (est, 4’ hi)
Blue erupting throughout this time. Feisty erupting during this time. |
| 5612 |
06 Aug 1975 @ 1800 |
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research-mab |
08/06/1975
Dark Cavern seems to have almost constant action lately. |
| 5601 |
15 Jul 1975 @ 1800 |
--- |
research-mab |
07/15/1975 Dark Cavern observed having minor eruptions of 30-50 sec duration every minute or so. |
| 5814 |
08 Sep 1974 @ 1800 |
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research-mab |
09/08/1974 Dark Cavern continues the steam (no water) eruptions |
| 5704 |
24 May 1974 @ 1800 |
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research-mab |
05/24/1974 Dk Cavern seen in eruption often during last few days. |
| 5703 |
22 May 1974 @ 1800 |
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research-mab |
05/22/1974 Dark Cavern was noted to be in eruption numerous times throughout the day. |
| 6202 |
17 Oct 1973 @ 1800 |
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research-mab |
10/17/1973 Dark Cavern: interval is irregular and sometimes shorter than as seen on October 1. R Hutchinson |
| 6198 |
01 Oct 1973 @ 1700 |
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research-mab |
10/01/1973
Porcelain Basin 5:00 pm
Dark Cavern interval shortening to about 20 min more water than recent and steam not as powerful. |
| 6104 |
28 Aug 1973 @ 1800 |
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research-mab |
08/28/1973 Dark Cavern still with violent steam action some muddy water erupting from it. {no specific time} |
| 6089 |
27 Aug 1973 @ 1800 |
--- |
research-mab |
08/27/1973 Dark Cavern still active (in similar manner as this afternoon) but with less intensity. {no specific time} |
| 5966 |
16 Apr 1973 @ 1800 |
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research-mab |
04/16/1973
Dark Cavern: most of the eruptions during the past few weeks have been noted to have no runoff even though they may be up to full height. Also, the durations, while not accurately measured, have been noticeably shorter. |
| 5924 |
15 Mar 1973 @ 1800 |
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research-mab |
03/15/1973 No eruptions were observed from Dark Cavern today in spite of the frequent periods of minor play. |
| 5909 |
10 Mar 1973 @ 1800 |
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research-mab |
03/10/1973 Dark Cavern: one eruption timed. Totally play 6:00 minutes, vigorous & noisy phase of eruption (after NW vent was covered) lasted 3:49, and only approximately 20 seconds were required for the water in the main vent to drain. Rick H |
| 6484 |
11 Sep 1972 @ 1200 |
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research-mab |
09/11/1972
Bear Den, Dark Cavern, Africa. L. Whirligig, Blue, Fireball & Arsenic all have been observed in eruption this morning. {generic a.m. time} |
| 6491 |
15 May 1972 @ 1800 |
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research-mab |
05/15/1972
Dark Cavern Geyser – minor spitting and sputtering every few minutes; major eruption once or twice an hour temp during minor play 200º |
| 6594 |
09 Sep 1970 @ 1600 |
--- |
research-mab |
09/09/1970 Dark Cavern erupted and played longer than usual.
{no specific time - listed after ledge in log} |
| 7673 |
12 Aug 1970 @ 1800 |
--- |
research-mab |
08/12/1970
Much activity in Porcelain in late pm (6-7)
Arsenic, Fireball, and Fan went off in succession.
8/12/1970 Dark Cavern had extended eruption also. |
| 7190 |
17 Aug 1966 @ 1600 |
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research-mab |
08/17/1966
Dark Cavern Took C&F (USGS) to watch (4pm) it and several cycles in a row were very weak – steam ceased without receiving water – Does Ledge have a weakening effect?
Had been very strong before Ledge erupted. |
| 7124 |
17 Jul 1966 @ 0800 |
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research-mab |
07/17/1966
Dark Cavern – Water has bluish cast in a.m. |
| 6897 |
27 Jun 1965 @ 1800 |
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research-mab |
06/27/1965 Dark Cavern continues to increase its water supply each day. A crack in its drainage channel continues to increase in size & overflow. |
| 6880 |
17 Jun 1965 @ 1800 |
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research-mab |
06/17/1965
Dark Cavern – I have watched it several times for as long as ½ hour at a time. Every several minutes the steam pressure will increase and then subside as it did last year. However, this year (so far) there is no water present. |
| 6785 |
23 Oct 1964 @ 1800 |
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research-mab |
10/23/1964 Dark Cavern is apparently fully restored. |
| 6781 |
18 Oct 1964 @ 1800 |
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research-mab |
10/18/1964 Dark Cavern appears fully restored. |
| 6777 |
17 Oct 1964 @ 1800 |
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research-mab |
10/17/1964 Dark Cavern has more water than yesterday. The west vent still shoots only steam (maybe that’s all it ever did). Very noisy. |
| 6766 |
16 Oct 1964 @ 1800 |
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research-mab |
10/16/1964 Dark Cavern has regained some water but is not yet fully restored. |
| 6744 |
09 Oct 1964 @ 1800 |
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research-mab |
10/09/1964 Dark Cavern has lost its water & just puffs steam. |
| 6638 |
21 Jun 1964 @ 1500 |
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research-mab |
06/21/1964 Dark Cavern 3:00p Bill Lewis observed this for ~ 30 min and found that it had a very nearly regular 10 min cycle. To Mr. Lewis’ knowledge this is the only geyser in the park which starts with a steam phase (rather than H20). |
| 10804 |
01 Jul 1933 @ 0000 |
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research-mab |
Report for June 1933: Hillside Geyser – eruptions of 10-15 ft at irregular intervals |
| 10813 |
19 Sep 1931 @ 0000 |
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research-mab |
Hillside Geyser
Sept 1-4 Played at irregular intervals 4-5 times per day. Height 10-15 ft. Duration – 40 sec.
Sept 5-19 No eruptions. Some water running from vent continuously. |
| 10821 |
05 Aug 1931 @ 0000 |
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research-mab |
Aug 1931 Report: Hillside Geyser
Aug 5 At irregular intervals 1 min 20 ft. |
| 10820 |
04 Aug 1931 @ 0000 |
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research-mab |
Aug 1931 Report:
8/4/1931 Hillside Geyser At 2 hr intervals all day 1 min 20 ft. |