Zobrazeno 1 - 10 of 48 pro vyhledávání: '"Richard Hereford"'
1
Detrital sanidine 40Ar/39Ar dating confirms <2 Ma age of Crooked Ridge paleoriver and subsequent deep denudation of the southwestern Colorado Plateau
Autor: Micael Albonico, Matthew T. Heizler, Kurt E. Sundell, Karl E. Karlstrom, L. Sue Beard, Richard Hereford, L. J. Crossey, Steven M. Cather
Publikováno v: Geosphere. 17:438-454
Crooked Ridge and White Mesa in northeastern Arizona (southwestern United States) preserve, as inverted topography, a 57-km-long abandoned alluvial system near the present drainage divide between the Colorado, San Juan, and Little Colorado Rivers. Th
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f622773bc0ecdbde1d86ba533e93d920
https://doi.org/10.1130/ges02319.1
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2
Historical and prehistorical water levels of Mormon Lake, Arizona as a measure of climate change on the southwest Colorado Plateau, USA
Autor: Lee Amoroso, Richard Hereford
Publikováno v: Quaternary Research. 100:32-51
Mormon Lake, elevation 2166 m with maximum historic surface area of 31.4 km2, lies in a forested endorheic basin covering 103 km2. It is the largest unaltered freshwater body on the 337,000 km2 Colorado Plateau. Prehistorical (before AD 1878) highsta
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ac14ddf0a02997de40a0f1d9dad451d1
https://doi.org/10.1017/qua.2020.92
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3
Cenozoic incision history of the Little Colorado River: Its role in carving Grand Canyon and onset of rapid incision in the past ca. 2 Ma in the Colorado River System
Autor: Richard Hereford, Karl E. Karlstrom, Shari A. Kelley, Ryan S. Crow, Laura J. Crossey, L.S. Beard, Jason W. Ricketts, Steve Cather, E. Embid, Matthew T. Heizler
Publikováno v: Geosphere. 13:49-81
This paper documents a multi-stage incision and denudation history for the Little Colorado River (LCR) region of the southwestern Colorado Plateau over the past 70 Ma. The first two pulses of denudation are documented by thermochronologic data. Diffe
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f694cba6705cb0262fa4ec6aa914aade
https://doi.org/10.1130/ges01304.1
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4
Reevaluation of the Crooked Ridge River—Early Pleistocene (ca. 2 Ma) age and origin of the White Mesa alluvium, northeastern Arizona
Autor: Laura J. Crossey, Richard Hereford, Karl E. Karlstrom, P. Kyle House, Matthew T. Heizler, Lee Amoroso, Mark Pecha, L. Sue Beard, William R. Dickinson
Publikováno v: Geosphere. 12:768-789
Essential features of the previously named and described Miocene Crooked Ridge River in northeastern Arizona (USA) are reexamined using new geologic and geochronologic data. Previously it was proposed that Cenozoic alluvium at Crooked Ridge and south
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b55af3b86cdd4d74b805a45df0b40e7d
https://doi.org/10.1130/ges01124.1
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7
Precipitation history and ecosystem response to multidecadal precipitation variability in the Mojave Desert region, 1893–2001
Autor: C.I. Longpré, Richard Hereford, Robert H. Webb
Publikováno v: Journal of Arid Environments. 67:13-34
Precipitation varied substantially in the Mojave Desert through the 20th century in a manner broadly similar to the other warm North American deserts. Episodes of drought and prolonged dry conditions (1893-1904, ca. 1942-1975, and 1999-present) alter
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fecb56f08f449a475f3effb26fe65a6f
https://doi.org/10.1016/j.jaridenv.2006.09.019
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9
Numerical Ages of Holocene Tributary Debris Fans Inferred from Dissolution Pitting on Carbonate Boulders in the Grand Canyon of Arizona
Autor: Kelly J. Burke, K.S. Thompson, Richard Hereford
Publikováno v: Quaternary Research. 50:139-147
Carbonate boulders transported down steep tributary channels by debris flow came to rest on Holocene debris fans beside the Colorado River in Grand Canyon National Park. Weakly acidic rainfall and the metabolic activity of blue-green algae have produ
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d164ee630b3eb43f7b4ca3796f480d5c
https://doi.org/10.1006/qres.1998.1987
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10
Historic variation of warm-season rainfall, Southern Colorado Plateau, Southwestern U.S.A
Autor: Richard Hereford, Robert H. Webb
Publikováno v: Climatic Change. 22:239-256
Rainfall during the warm season (June 15–October 15) is the most important of the year in terms of flood generation and erosion in rivers of the southern Colorado Plateau. Fluvial erosion of the plateau decreased substantially in the 1930s to early
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5789f812f8d83f4584505a0c86a30ece
https://doi.org/10.1007/bf00143030
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