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It shows that when some of these volcanoes were in action the valleys had already been eroded to their present depth. The tufaceous alluvium called trass, which has covered large areas in the Eifel, and choked up some valleys now partially re-excavated, is unstratified.
The bed of the stream being filled with lava, its waters not flowing through the gravel, were forced to find other channels. The action of the elements during subsequent ages has worn away in great part the banks of the pliocene river and eroded in places the solid slate rocks to the depth of two thousand feet, leaving this sinuous wall as a mute witness of the mighty forces of nature.
The hills, to-day, sometimes break sharply off, leaving an eroded, often vine-festooned palisade some fifty feet in height, at the base of which is a long, tree-clad slope of debris; then, a narrow, level terrace from fifty to a hundred yards in width, which drops suddenly to a rocky beach; this in turn is often lined along the water's edge with irregularly-shaped boulders, from the size of Pilgrim to fifteen or twenty feet in height, and worn smooth with the grinding action of the river.
Ben began ripping out the eroded blocks with a special tool. Feldman carried them back and stacked them along with others. A plasma furnace melted them down into new blocks. The work grew progressively worse as the distance to the tube-room increased. The tube mouth yawned closer and closer. There were no handholds there only the friction of a man's body in the tube.
All have approximately the form of greatest strength with reference to the overflow of an ice-sheet, excepting those mentioned above, which have been more or less eroded by local residual glaciers. Every channel also has the form of greatest strength with reference to ice-action. Islands, as we have seen, are still being born in Glacier Bay and elsewhere to the northward.
"Starlight and you and Na-che's little song," murmured Enoch; "I am hard to satisfy, am I not?" He put his arms about Diana and kissed her softly, then let her lead the way down to the spring. And shortly, rolled in his blankets, his feet to the dying fire, Enoch was deep in sleep. Sun-up found them on the trail again. All day the way wound through country that had been profoundly eroded.
Towards the climax he was a furious spender; he shopped with large unexpected purchases, he shopped like a mind seeking expression, he shopped to astonish and dismay; shopped crescendo, shopped fortissimo, con molto espressione until the magnificent smash of Crest Hill eroded his shopping for ever. Always it was he who shopped. My aunt did not shine as a purchaser.
To a somewhat less depth it has been leached of its lime and other soluble ingredients. In the weathered zone its pebbles, especially where the till is loose in texture, are sometimes so rotted that granites may be crumbled with the fingers. The Kansan drift is therefore old. THE WISCONSIN FORMATION. The Wisconsin drift sheet is but little weathered and eroded, and therefore is extremely young.
Eleven weeks later Naboth had eaten his way nearly through that shrubbery, and there was a reed hut with a bedstead outside it, standing in the little glade that he had eroded. Two dogs and a baby slept on the bedstead. So I fancied Naboth had taken a wife. He said that he had, by my favour, done this thing, and that I was several times finer than Krishna.
There is little doubt that these unfrequented canyons have many and extensive cliff houses, the existence of which has thus far escaped the explorer. The sandstone of which they are composed is much eroded into caves with overhanging roofs, forming admirable sites for cliff houses as distinguished from cavate dwellings like those we have described.
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