Studies Scientific & Social: By Alfred Russel Wallace ..., 1. ciltMacmillan and Company, limited, 1900 |
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abundant adapted Africa allied alluvium Alpine America animals appear apterous argument Asia Australians Azores beautiful BIRD OF PARADISE birds causes characteristic characters coast colour considerable continuous crust curious Darwin denudation distinct Eastern equally erosion erratics Europe European evidence existence extensive fact favourable feet flora flowers forests genera genus geological geologists glacial glacier gorge groups Guinea hair ice age ice-sheet important individual inhabit insects islands Lake Zurich lakes land larvæ lemurs less Madeira Mahoris Malay miles Miocene modification monkeys moraine mountain native natural selection naturalists Nearctic nearly North occur ocean organic origin origin of species Palearctic Papuans peculiar phenomena plants Polynesians portion probably produced Professor race regions remarkable Rhone glacier river rock rocky slopes species streams supposed surface tail theory thickness tion trees tribes tropical valley valley-lakes variation varied whole winged writers Yosemite YOSEMITE VALLEY
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Sayfa 7 - Yo-Semite, throughout its whole length ; but besides these, there are many other striking peculiarities and features, both of sublimity and beauty, which can hardly be surpassed, if equalled, by those of any mountain valleys in the world.
Sayfa 1 - This meadow was along Little Carp river, about a quarter of a mile east of Little Carp Lake. It was about a mile long and a quarter of a mile wide, the Little Carp river running through the middle of it. The ground was quite marshy in many places and was covered with grass, there being no trees in the meadow. There were several willow and alder bushes at the east end. The surrounding trees were alder, tamarack, arbor vitae, balsam and birch. Observations...
Sayfa 51 - There unquestionably exists within and below volcanic vents, a body of lava of unknown dimensions, permanently liquid at an intense temperature, and continually traversed by successive volumes of some aeriform fluid, which escape from its surface — thus presenting all the appearance of a liquid in constant ebullition.
Sayfa 12 - I descended), partly natural and partly made by the owner of the land, they cannot escape; for this valley is in every other part surrounded by perpendicular cliffs, and eight miles lower down, it contracts from an average width of half a mile, to a mere chasm, impassable to man or beast. Sir T. Mitchell...
Sayfa 11 - I have tried) the trees growing at the depth of between 1,000 and 1,500 feet below him; on both hands he sees headland beyond headland of the receding line of cliff, and on the opposite side of the valley, often at the distance of several miles, he beholds another line rising up to the same height with that on which he stands, and formed of the same horizontal strata of pale sandstone.
Sayfa 10 - ... within the past few years, no inconsiderable amount to the talus. Several of these great rock-avalanches have taken place since the Valley was inhabited. One which fell near Cathedral Rock is said to have shaken the Valley like an earthquake. This abrasion of the edges of the Valley has unquestionably been going on during a vast period of time ; what has become of the detrital material ? Some masses of granite now lying in the Valley — one in particular near the base of the Yosemite Fall —...
Sayfa 45 - They can be interpreted only in one way, viz., that the formations in question began to be laid down in shallow water; that during their formation the area of deposit gradually subsided for thousands of feet ; yet that the rate of accumulation of sediment kept pace on the whole with this depression ; and hence that the original shallow-water character of the deposits remained, even after the original sea-bottom had been buried under a vast mass of sedimentary matter.
Sayfa 101 - ... and be added to the grinding material below. That this was so is proved by the great quantity of stones and grit in the
Sayfa 12 - ... into some of these valleys it is necessary to go round twenty miles; and into others the surveyors have only lately penetrated, and the colonists have not yet been able to drive in their cattle. But the most remarkable feature in their structure is, that although several miles wide at their heads, they generally contract towards their mouths to such a degree as to become impassable.
Sayfa 10 - ... vertical displacement for the small area implicated which makes this a peculiar case ; but it would not be easy to give any good reason why such an exceptional result should not be brought about, amid the complicated play of forces which the elevation of a great mountain chain must set in motion. By the adoption of the subsidence theory for the formation of the Yosemite, we are able to get over one difficulty which appears insurmountable with any other. This is, the very small amount of dtbris...