The ice age in North America and its bearing upon the antiquity of man5th edwith many new maps and illus., enland rewritten to incorporate the facts that bring it up to date, with chapters on Lake Agassiz and the Probable cause of glaciation . with the humus still about their roots. An abundanceof their cones, still preserving their shape, lies about theirroots ; and the texture of the wood is still unimpaired. Oneof these upright trunks measured ten feet in circumferenceabout fifteen feet above the roots. Some of the smaller up-right trees have their branches and twigs still intact, pre-servi
The ice age in North America and its bearing upon the antiquity of man5th edwith many new maps and illus., enland rewritten to incorporate the facts that bring it up to date, with chapters on Lake Agassiz and the Probable cause of glaciation . with the humus still about their roots. An abundanceof their cones, still preserving their shape, lies about theirroots ; and the texture of the wood is still unimpaired. Oneof these upright trunks measured ten feet in circumferenceabout fifteen feet above the roots. Some of the smaller up-right trees have their branches and twigs still intact, pre-serving the normal conical appearance of a recently deadcedar-tree. These trees are in various stages of exposure. Some of A MOMII WITH THE MUIR GLACIER. 03 them are uncovered to the roots ; some are washed wholly outof the soil; while others are still buried and standing upright,in horizontal layers of tine sand and gravel, some with topsprojecting from a depth of twenty or thirty feet, others beingdoubtless entirely covered. The roots of these trees are in acompact, stiff clay stratum, blue in color, without grit, inter-sected by numerous minute rootlets, and which is, in places,twenty feet thick. There is also, occasionally, in this sub-. FiQ. 28.—Shows stumps of trees on east side of the glacial torrAit. Note the line of sep-aration between the enveloping sand and the soil in which the roots are stump appears on the right, split in two, but one half standing. The gravel corre-sponds in height with that on the west side. The glacier appears in the oackgroundon the right. (From photograph, looking north.) stratum of clay, a small fragment of wood, as well as somesmooth pebbles from an inch to two feet in diameter. Thesurface of this substratum is at this point 85 feet above theinlet. The deposit of sand and gravel covering the forestrises 115 feet higher, and is level-topped at that height, butrising toward the north till it reaches the shoulder of themountain at an e
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Keywords: ., bookauthoruphamwarren18501934, bookcentury1900, bookdecade1910
