. Annual report. 1st-12th, 1867-1878. Geology. 182 KEPOET UNITED STATES GEOLOGICAL SURVEY. a white ground. It was impossible to obtain the temperature in the central jjortion of the basin. In the outlet the water had a temperature of 175° F. This was taken on the terraces above the deeper channels, and was of course lower than the actual temperature of the spring. Around the outside of the pit, or caldron, a pile of debris composed of brolien ijieces of geyserite was seen, forming a sort of rim, just as though, it had been washed back by an overflow of the spring. This, however, I think is imp
. Annual report. 1st-12th, 1867-1878. Geology. 182 KEPOET UNITED STATES GEOLOGICAL SURVEY. a white ground. It was impossible to obtain the temperature in the central jjortion of the basin. In the outlet the water had a temperature of 175° F. This was taken on the terraces above the deeper channels, and was of course lower than the actual temperature of the spring. Around the outside of the pit, or caldron, a pile of debris composed of brolien ijieces of geyserite was seen, forming a sort of rim, just as though, it had been washed back by an overflow of the spring. This, however, I think is impossible on account of the absence of a wall at the foot of the spring. It is possible that it may be a geyser witb long periods, but we have no data to that effect. Since the above notes were made, this Cliff Caldron has been discov- ered to be a powerful geyser, to which Mr. P. W. Korris has given the name Excelsior. The following record of its eruptions is taken from the report made by Mr. C. H. Wyman to Mr. P. W. JSTorris. (See Ee- port of the Superintendent of the Yellowstone ISTational Park, by P. W. i^orris, 1881, pp. 54-06.) Becord of theeru^tions of the Excelsior Geyser in the Midway Basin, Yellowstone National Park. Date. Time of Eemarks. 1880.* Sept. 27 8. 00 a. m 27 27 p. m 27 p. m 28. 9, 00 a. m 28 10. 30 a. m 28 a. m 28 3. 00 p. m 28 28 7. 30 p. m 29 9. 30 a. m 29 p. m 20 5. 00 p. m 29 7. 20 p. m 30 9. 00 a. m 30 3. 00 p. m 30 5. 20 p. m 30 p. m 30 9. 30 p. m Oct. 1 a. m 8. OG a. m a. m 12. 55 p. m 3. 50 p. m 5. 40 p. m p. m 9. 00 p. m 2 a. m 2 3. 30 a. in a. m. a. ra a. m p. m. 5 100 7 75 7 100 6 90 5 60 7 75 7 75 5 100 6 100 7 125 7 eo 5 60 5 70 7 75 5 50 7 100 5 125 5 75 6 75 5 60 10 150 15 100 10 200 10 250 10 225 5 75 5 75 5 75 5 75 Witnesssed the last eruption from a distance. Heavy foo; in the morning, clear until snnset, and thence dense mists from the Excelsi
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