Post 00192
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The variously tinted sinter and travertine formations, outspread like pavements over large areas of the geyser valleys, lining the spring basins and throats of the craters, and forming beautiful coral-like rims and curbs about them, always excite admiring attention; so also does the play of the waters from which they are deposited. The various minerals in them are rich in colors, and these are greatly heightened by a smooth, silky growth of brilliantly colored confervæ which lines many of the pools and channels and terraces. No bed of flower-bloom is more exquisite than these myriads of minute plants, visible only in mass, growing in the hot waters. Most of the spring borders are low and daintily scalloped, crenelated, and beaded with sinter pearls. Some of the geyser craters are massive and picturesque, like ruined castles or old burned-out sequoia stumps, and are adorned on a grand scale with outbulging, cauliflower-like formations. From these as centres the silex pavements slope gently away in thin, crusty, overlapping layers, slightly interrupted in some places by low terraces. Or, as in the case of the Mammoth Hot Springs, at the north end of the park, where the building waters issue from the side of a steep hill, the deposits form a succession of higher and broader terraces of white travertine tinged with purple, like the famous Pink Terrace at Rotomahana, New Zealand, draped in front with clustering stalactites, each terrace having a pool of indescribably beautiful water upon it in a basin with a raised rim that glistens with confervæ,—the whole, when viewed at a distance of a mile or two, looking like a broad, massive cascade pouring over shelving rocks in snowy purpled foam.
The stones of this divine masonry, invisible particles of lime or silex, mined in quarries no eye has seen, go to their appointed places in gentle, tinkling, transparent currents or through the dashing turmoil of floods, as surely guided as the sap of plants streaming into bole and branch, leaf and flower. And thus from century to century this beauty-work has gone on and is going on.
Passing through many a mile of pine and spruce woods, toward the centre of the park you come to the famous Yellowstone Lake. It is about twenty miles long and fifteen wide, and lies at a height of nearly 8000 feet above the level of the sea, amid dense black forests and snowy mountains. Around its winding, wavering shores, closely forested and picturesquely varied with promontories and bays, the distance is more than 100 miles. It is not very deep, only from 200 to 300 feet, and contains less water than the celebrated Lake Tahoe of the California Sierra, which is nearly the same size, lies at a height of 6400 feet, and is over 1600 feet deep. But no other lake in North America of equal area lies so high as the Yellowstone, or gives birth to so noble a river. The terraces around its shores show that at the close of the glacial period its surface was about 160 feet higher than it is now, and its area nearly twice as great.