| 翻訳と辞書 |
Lake Abert
Lake Abert (also known as Abert Lake) is a large, shallow, alkali lake in Lake County, Oregon, United States. It is approximately long and wide at its widest point. It is located northwest of the small, unincorporated community of Valley Falls, Oregon. The lake was named in honor of Colonel John James Abert by explorer John C. Fremont during his 1843 expedition into Central Oregon. No fish live in the alkaline waters of the lake; however, its dense population of brine shrimp supports a variety of shorebirds. The lake is also an important stop on the bird migration route known as the Pacific flyway.
== Ancient Lake Chewaucan ==
The arid land around Lake Abert was once lush. During the Pleistocene epoch, vast areas of south-central Oregon were covered by lakes and wetlands. As the last ice age was ending, rain and runoff from melting snow filled the lowlands throughout this region of the Great Basin, creating an immense freshwater lake called Lake Chewaucan. The lake covered at depths of up to .〔Deike, Ruth G. and Blair F. Jones, ("Provenance, Distribution and Alteration of Volcanic Sediments in a Saline Alkaline Lake" ), ''Developments of Sedimentology'' (A. Nissenbaum, editor), Elsevier Scientific Publishing Company, Amsterdam, The Netherlands (distributed in the United States and Canada by Elsevier/North-Holland, Inc of New York), 1980.〕〔Licciardi, Joseph M., ("Chronology of latest Pleistocene lake-level fluctuations in the pluvial Lake Chewaucan basin, Oregon, USA" ), ''Journal of Quaternary Science'' (Volume 16), John Wiley and Sons, 2001, p. 545.〕〔Bowker, Kimberly, ("Salt of the Earth - At Lake Abert, beauty never smelled so bad" ), ''The Bulletin'', Bend, Oregon, 31 December 2009.〕〔"Ancient Lakes", Oregon Historical Marker, Summer Lake, Oregon.〕
Lake Chewaucan covered the Abert and Summer Lake basins for most of the late Pleistocene epoch. The last high water period occurred about 13,000 years ago. There is no archaeological evidence of human utilization of Lake Chewaucan during this time. The earliest evidence for possible human occupation of the basin comes from the Paisley Caves excavated by Luther Cressman in the late 1930s. Cressman found some inconclusive evidence that humans could have begun occupation of the area around 11,000 years ago.〔Jerrems, Jerry, ("An Archaeological View of Summer Lake Valley, Oregon" ), Sundance Archeological Research Fund, University of Nevada, Reno, Reno Nevada, 27 April 2007.〕
Lake Chewaucan began to dry up at the close of the Pleistocene epoch. As it shrank, salts and alkali were concentrated in its remaining waters, and the result was the formation of Lake Abert and Summer Lake. Today, the two lakes are apart and are the only remnants of Lake Chewaucan.〔("Pluvial Lakes: Oregon’s inland seas" ), ''Oregon: A Geologic History'', Oregon Department of Geology and Mineral Industries, Portland, Oregon, 9 February 2010.〕〔(Oregon topographic map ), United States Geological Survey, United States Department of Interior, Reston, Virginia; displayed via ACME mapper, ''www.acme.com'', 9 February 2010.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Lake Abert」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|