ity. Intermittent outpourings went on through long periods of time. Volcanoes in and near the Park threw forth quantities of ashes, lava, and cinders, which built up a plateau region three or four

ide areas, shaped ca?ons, and rounded mountain-sides, produced and spread soil

te. It measures about twenty-four by twenty by eighteen feet. It was transported to this resting-place from mountains more than thirty

years is shown in the deep deposits of silica and travertine that overspread extensive area. During the ice age many of these deposits were eroded and others were piled with boulders. It is plain that steam

t Washburn. Unwritten as yet is the splendid geological story of this change, which may have been caused by earthquake upheaval or by subsidence. It appears to have occurred about the close of the last glacial epoch. Possibly ice d

with all the hues of the sunset sky. Its precipitous walls are comparatively free from vegetation and are broken with pinnacles and jagged ridges. About f

. From the near-by rim, this wonderful waterfall appears like an enormous, fluffy, endless pouring of whitest snowfla

by Hayne

ON FROM A

ONE NATI

The mud in many pots is red or pink; that in others is lavender, blue, orange, or yellow. Occasionally a rugged vat of this mud is found boiling away-very suggestive of slaking lime. In other cases, plastic mud throbs and undulates as steam-jets

ational Parks," says

s, mush and broth caldrons whose contents are of every color and consistency, plash and heave and roar in bewildering abundance. In the adjacent mountains, beneath the living trees the edges of petrified forests are exposed to view, like specimens on the shelves of a museum, standing on ledges tier above tier where they grew, solemnly silent in rigid crystalline beauty after swaying in the wi

his rugged, narrow pass cuts through high, crowding mountains. To the north, Hoyt Mountain and Avalanche Peak rise precipitously; to the south, Grizzly and Top Notch Peaks. Sylvan Lake, whose pec

n the Park. Its appearance across Yellowstone Lake, from a point near the outlet, is magnificent. Anoth

along the southeast corner, and the mountainous tract immediately west and north of the northwest corner of the Park. A