. Annual report. 1st-12th, 1867-1878. Geology. GEOLOGICAL SURVEY OF THE TERRITORIES. 125 Dr. Endlicli lias lujule the following analysis of the deposits from these springs: Per cent Loss at 110° C 1. 75percent. / 32 10 Loss at 30. 35 per cent. ^ Lime Silica Ferric oxyd 3. (52 Alumina Magnesia Trace. Soda* Trace. 100. 05 Fig. 32. Figures 31 and 32, drawn by Mr. Holmes, will perhaps give the reader a good idea of some of the peculiar formations noticed at these springs. Fig. 31 shows the pools or basins which were so fully described by Dr. Hayden in the report for 1871
. Annual report. 1st-12th, 1867-1878. Geology. GEOLOGICAL SURVEY OF THE TERRITORIES. 125 Dr. Endlicli lias lujule the following analysis of the deposits from these springs: Per cent Loss at 110° C 1. 75percent. / 32 10 Loss at 30. 35 per cent. ^ Lime Silica Ferric oxyd 3. (52 Alumina Magnesia Trace. Soda* Trace. 100. 05 Fig. 32. Figures 31 and 32, drawn by Mr. Holmes, will perhaps give the reader a good idea of some of the peculiar formations noticed at these springs. Fig. 31 shows the pools or basins which were so fully described by Dr. Hayden in the report for 1871, and which form one of the most beautiful features of the springs. The water in all of them is either warm or hot according to their position, the lower ones having the coolest water. The water has also that exquisitely beau- tiful blue tint which is beyond description, and which forms such handsome contrasts to the white, marble-like basins in which it is. The water pours from one basin to another and forms stalactitic processes, which hang from their sides as seen in the picture. At the bottom of the upper basin in the illustration the processes have united with those formed ornamental rim of extinct spring, gardim^rs river. from below by the dropping of the water, while in the lower basin they have not yet come together, but still form true stalactitic processes. Over the outside surfaces of the basins we find also bead-like processes, caused also by the drop})ing of the water. The great amount of lime in these deijosits gives them a beautiful wliite CHAPTER III. GAEDIKER'S EIVER TO MUD VOLCANOES, YELLOWSTONE VALLEY. We left the Hot Springs on the 29th of July and made our next camp on Black-Tail Deer Creek near the Yellowstone, a few miles above Gar- diner's River. Our camp was on a portion of the plateau that extends eastward from the top of the bluft-wall opposite the springs. The rock immediately beneath us was a violet-colored trachyte containing crys- ta
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