Entering the park, a high, broad, forested elevation is quickly encountered which looks at a glance exactly what it is, the base which once supported a towering cone. At its summit, this swelling base is found to be the outside supporting wall of a roughly circular lake, about five miles in diameter, the inside wall of which is steeply inclined to the water's surface a thousand feet below. The strong contrast between the outer and inner walls tells a plainly read story. The outer walls, all around, slope gently upward at an angle of about fifteen degrees; naturally, if carried on, they would converge in a peaked summit higher than that of Shasta. The inner walls converge downward at a steep angle, suggesting a funnel of enormous depth. It was through this funnel that Mount Mazama, as men call the volcano that man never saw, once collapsed into the gulf from which it had emerged.
Studying the scene from the Lodge on the rim where the automobile-stage has left you, the most vivid impressions of detail are those of the conformation of the inner rim, the cliffs which rise above it, and the small volcano which emerges from the blue waters of the lake.
The marvellous inner slope of the rim is not a continuous cliff, but a highly diversified succession of strata. Examination shows the layers of volcanic conglomerate and lava of which, like layers of brick and stone, the great structure was built. The downward dip of these strata away from the lake is everywhere discernible. The volcano's early story thus lies plain to eyes trained to read it. The most interesting of these strata is the lava flow which forms twelve thousand feet of the total precipice of Llao Rock, a prominence of conspicuous beauty.
Many of these cliffs are magnificently bold. The loftiest is Glacier Peak, which rises almost two thousand feet above the water's surface. But Dutton Cliff is a close rival, and Vidæ Cliff, Garfield Peak, Llao Rock, and the Watchman fall close behind. Offsetting these are breaks where the rim drops within six hundred feet of the water. The statement of a wall height of a thousand feet expresses the general impression, though as an average it is probably well short of the fact.
From a photograph copyright by Scenic America Company
From a photograph copyright by Scenic America Company