The Salton Sea PDF Download

Author: Daniel Trembly MacDougal
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 286

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Author: Macdougal D. T.
Publisher:
ISBN: 9780243755974
Category :
Languages : en
Pages :

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Author: Daniel Trembly MacDougal
Publisher:
ISBN:
Category : Salton Sea (Calif.)
Languages : en
Pages : 182

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Author: D. T. Macdougal
Publisher:
ISBN: 9781331949893
Category : Science
Languages : en
Pages : 266

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Excerpt from The Salton Sea: A Study of the Geography, the Geology, the Floristics, and the Ecology of a Desert Basin The geological and biological processes of the surface layers of the earth's crust are profoundly different under subaerial exposures to those which prevail under subaqueous conditions. Any region, therefore, which may be subjected to submergence and to weathering, alternately, will offer a changing complex of environic conditions, with accompanying disturbances in the balance and distributional movements of the organisms of the region. The solid ground, in one case, is subject to the erosion of precipitation-water and stream-flow, coupled with a leaching action of the water, while surface material will be variously transported and deposited. Wind effects will vary widely with aridity and other climatic features, while precipitation, evaporation, and temperature will act as determinants as to the character of the living forms supported. The submersion of any area may be expected to be followed by the complete or nearly complete destruction of the land flora and fauna. The temperature of the substratum is equalized, variations in moisture disappear, wind comes in only as an agency for transporting propogative bodies and as a cause of wave-action, sorting, wearing, and depositing material along shore lines. The deposition of sedimentary material in submerged areas under lakes takes place in such manner as to be easily distinguishable from the effects of stream-action. The superposition of the two groups of effects in any region such as the lowermost part of a desert basin, especially when submergence and desiccation alternate at intervals of sufficient length to give full force to the two extremes, might be expected to offer highly unusual physical conditions of the surface layers and of the soil, to which organisms would be expected to display reactions of interest and importance useful in the interpretation of phytogeographical phenomena in general. The great Cahuilla Basin, which lies to the westward of the lower or southern part of the main delta of the Colorado River, has been the scene of alternations of the kind in question. The lower part of this basin has been submerged and desiccated many times in the last few hundred years, as attested by the numerous beach or strand formations and layers of travertine on the shores. The making of the lake in 1904, 1905, and 1906, at the time of the organization of the work of the Desert Laboratory, offered opportunities for some studies the results of which are presented in the present paper. The facts to be taken into account were so diverse in character, and the necessary methods of calibration and estimation so unlike, that the cooperation of a number of workers in various branches of science was enlisted. First of all the senior contributor was so fortunate as to secure a general sketch of the geology and topography of the basin by the late Professor William Phipps Blake, whose barometric measurements as a member of the Williamson expedition in 1853 first established the fact that the region was an inclosed basin, the lowermost part of which was below sea-level. The history of earlier travel and the general geography of the basin is described by Mr. G. Sykes, geographer of the Desert Laboratory. The analyses of water samples have been carried out under the direction of Professor R. H. Forbes, at the Agricultural Experiment Station of Arizona, by the aid of Dr. W. H. Ross and Professor A. E. Vinson. The surface geology, with especial reference to the soil formations, has been the subject of much painstaking examination by Mr. E. E. Free, formerly of the United States Bureau of Soils. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com

Author: HardPress
Publisher: Hardpress Publishing
ISBN: 9781313055628
Category :
Languages : en
Pages : 290

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Unlike some other reproductions of classic texts (1) We have not used OCR(Optical Character Recognition), as this leads to bad quality books with introduced typos. (2) In books where there are images such as portraits, maps, sketches etc We have endeavoured to keep the quality of these images, so they represent accurately the original artefact. Although occasionally there may be certain imperfections with these old texts, we feel they deserve to be made available for future generations to enjoy.

Author: Daniel Trembly MacDougal
Publisher: Nabu Press
ISBN: 9781294714149
Category :
Languages : en
Pages : 266

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This is a reproduction of a book published before 1923. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing commitment to the preservation of printed works worldwide. We appreciate your understanding of the imperfections in the preservation process, and hope you enjoy this valuable book.

Author: Daniel Trembly MACDOUGAL
Publisher:
ISBN:
Category :
Languages : en
Pages : 182

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Author: John O'Donovan
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: William Grovenor McGinnies
Publisher: University of Arizona Press
ISBN: 9780816507283
Category : Science
Languages : en
Pages : 300

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McGinnies's book is an excellent review of all aspects of the Sonoran desert and its mountains: geographic, climatic, and geologic.ÑAmerican Scientist "This book provides a fascinating introduction to desert life in the Southwest."ÑTrue West "This true labor of love by an outstanding arid lands authority will broaden horizons, deepen understanding, and heighten awareness of the debt we owe to the founders of the Desert Laboratory."ÑArizona Highways "A great source of revelation. . . . Easy and enjoyable to read and has left me with a great respect for the diversity of ways in which desert plants adapt to extremes."ÑSylvia Martinelli, Journal of Arid Environments

Author: Nicola Mößner
Publisher: Taylor & Francis
ISBN: 1351966448
Category : Science
Languages : en
Pages : 275

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This collection offers a new understanding of the epistemology of measurement. The interdisciplinary volume explores how measurements are produced, for example, in astronomy and seismology, in studies of human sexuality and ecology, in brain imaging and intelligence testing. It considers photography as a measurement technology and Henry David Thoreau's poetic measures as closing the gap between mind and world. By focusing on measurements as the hard-won results of conceptual as well as technical operations, the authors of the book no longer presuppose that measurement is always and exclusively a means of representing some feature of a target object or entity. Measurement also provides knowledge about the degree to which things have been standardized or harmonized – it is an indicator of how closely human practices are attuned to each other and the world.