An ostracode based paleolimnologic and paleohydrologic history of Death Valley: 200 to 0 ka

2005 ◽  
Vol 117 (11) ◽  
pp. 1379 ◽  
Author(s):  
Richard M. Forester ◽  
Tim K. Lowenstein ◽  
Ronald J. Spencer
Keyword(s):  
Death Valley ◽  
History Of

THERMOKINEMATIC HISTORY OF THE BADWATER TURTLEBACK IN DEATH VALLEY, CALIFORNIA

2017 ◽  
Author(s):  
Travis M. Sizemore ◽  
◽  
Ibrahim Cemen ◽  
Matthew Wielicki ◽  
Daniel F. Stockli ◽  
...  
Keyword(s):  
Death Valley ◽  
History Of

Ernest Leslie Ransome

2019 ◽  
Vol 96 (3) ◽  
pp. 77-96
Author(s):  
Stephen Mikesell
Keyword(s):  
United States ◽  
Reinforced Concrete ◽  
The United States ◽  
Art Museum ◽  
Death Valley ◽  
Secondary Sources ◽  
History Of ◽  
Culinary Institute Of America ◽  
Historical Accounts ◽  
St Helena

Ernest L. Ransome is a famous but often misunderstood 19th century California engineer and builder. Architectural historians and engineering professionals see him as a central figure in developing reinforced concrete as a usable building material decades before its use became prevalent. He is most commonly recognized as building the first reinforced concrete bridge, San Francisco's Alvord Lake Bridge, which was built in 1890 and is still in use. Historical accounts of his work, however, are based chiefly upon secondary sources and are sometimes incorrect or misleading. This article clarifies Ransome's true role in concrete building in California and debunks misinformation about the famous Alvord Lake Bridge. It traces his career in the United States (he emigrated to California in 1870 at the age of 26), first as a manufacturer of imitation stone and later as a builder of increasingly large and complex buildings and structures. It discusses his work on a series of iconic Northern California buildings and structures: the 1888 Bourn Winery (now the Culinary Institute of America school in St. Helena); the 1890 Torpedo Building, still standing on the Oakland side of Yerba Buena Island; the 1890 Alvord Lake Bridge and its near twin the Conservatory Bridge, both still in use in Golden Gate Park; the 1891 Art Museum, now being used as the Canter Center on the Stanford University campus. It also discusses Ransome's partnership with Sidney Cushing, a railroad magnate in Marin County for whom the Cushing Amphitheater on Mt. Tamalpais was named, and Francis Marion “Borax” Smith, who built the borax industry in Death Valley and who founded and owned the Key System transit in the East Bay. The article concludes with observations about Ransome's true place in the history of concrete engineering in the United States and concrete construction in California.

scholarly journals Diabolical survival in Death Valley: recent pupfish colonization, gene flow and genetic assimilation in the smallest species range on earth

2016 ◽  
Vol 283 (1823) ◽  
pp. 20152334 ◽  
Author(s):  
Christopher H. Martin ◽  
Jacob E. Crawford ◽  
Bruce J. Turner ◽  
Lee H. Simons
Keyword(s):  
Gene Flow ◽  
Demographic History ◽  
Genetic Assimilation ◽  
Death Valley ◽  
Court Case ◽  
Devils Hole ◽  
Supreme Court Case ◽  
History Of ◽  
New Perspective ◽  
Outstanding Question

One of the most endangered vertebrates, the Devils Hole pupfish Cyprinodon diabolis , survives in a nearly impossible environment: a narrow subterranean fissure in the hottest desert on earth, Death Valley. This species became a conservation icon after a landmark 1976 US Supreme Court case affirming federal groundwater rights to its unique habitat. However, one outstanding question about this species remains unresolved: how long has diabolis persisted in this hellish environment? We used next-generation sequencing of over 13 000 loci to infer the demographic history of pupfishes in Death Valley. Instead of relicts isolated 2–3 Myr ago throughout repeated flooding of the entire region by inland seas as currently believed, we present evidence for frequent gene flow among Death Valley pupfish species and divergence after the most recent flooding 13 kyr ago. We estimate that Devils Hole was colonized by pupfish between 105 and 830 years ago, followed by genetic assimilation of pelvic fin loss and recent gene flow into neighbouring spring systems. Our results provide a new perspective on an iconic endangered species using the latest population genomic methods and support an emerging consensus that timescales for speciation are overestimated in many groups of rapidly evolving species.

DUCTILE DEFORMATIONAL HISTORY OF THE CENTRAL PANAMINT MOUNTAINS, DEATH VALLEY, CA

2018 ◽  
Author(s):  
Tai Antonia Subia ◽  
◽  
Terry L. Pavlis ◽  
Jade Ashley Brush
Keyword(s):  
Death Valley ◽  
Deformational History ◽  
History Of ◽  
Panamint Mountains

scholarly journals Women of American Chamber Music

2019 ◽  
Vol 4 ◽  
Author(s):  
Laena Batchelder ◽  
Class of 2019
Keyword(s):  
Chamber Music ◽  
String Quartet ◽  
Women Composers ◽  
Classical Music ◽  
String Quartets ◽  
Death Valley ◽  
Current Status ◽  
Violin Sonata ◽  
Program Notes ◽  
History Of

On February 20, 2019, Laena Grace Batchelder, with her colleagues, performed a recital of three chamber pieces by American women composers. The first was Amy Beach’s Violin Sonata played with Mr. Edward Newman. The other two pieces were string quartets performed by the Uproar String Quartet, which included Batchelder’s fellow TCU students: Manuel Ordóñez, Ashley Santore, and Manuel Papale. They played Missy Mazzoli’s Death Valley Junction and Jennifer Higdon’s An Exaltation of Larks. In addition to the performance, Batchelder researched the current status of women in classical music, the history of American female composers, and the three composers she programmed and their pieces. From this research, she wrote detailed program notes for the audience to read.

scholarly journals Evaluating the Shinumo-Sespe drainage connection: Arguments against the “old” (70–17 Ma) Grand Canyon models for Colorado Plateau drainage evolution

Geosphere ◽  
2020 ◽  
Vol 16 (6) ◽  
pp. 1425-1456
Author(s):  
Karl E. Karlstrom ◽  
Carl E. Jacobson ◽  
Kurt E. Sundell ◽  
Athena Eyster ◽  
Ron Blakey ◽  
...  
Keyword(s):  
Detrital Zircon ◽  
Gulf Of California ◽  
Colorado Plateau ◽  
Grand Canyon ◽  
River System ◽  
Death Valley ◽  
Transverse Ranges ◽  
Drainage Connection ◽  
The Pacific ◽  
History Of

Abstract The provocative hypothesis that the Shinumo Sandstone in the depths of Grand Canyon was the source for clasts of orthoquartzite in conglomerate of the Sespe Formation of coastal California, if verified, would indicate that a major river system flowed southwest from the Colorado Plateau to the Pacific Ocean prior to opening of the Gulf of California, and would imply that Grand Canyon had been carved to within a few hundred meters of its modern depth at the time of this drainage connection. The proposed Eocene Shinumo-Sespe connection, however, is not supported by detrital zircon nor paleomagnetic-inclination data and is refuted by thermochronology that shows that the Shinumo Sandstone of eastern Grand Canyon was >60 °C (∼1.8 km deep) and hence not incised at this time. A proposed 20 Ma (Miocene) Shinumo-Sespe drainage connection based on clasts in the Sespe Formation is also refuted. We point out numerous caveats and non-unique interpretations of paleomagnetic data from clasts. Further, our detrital zircon analysis requires diverse sources for Sespe clasts, with better statistical matches for the four “most-Shinumo-like” Sespe clasts with quartzites of the Big Bear Group and Ontario Ridge metasedimentary succession of the Transverse Ranges, Horse Thief Springs Formation from Death Valley, and Troy Quartzite of central Arizona. Diverse thermochronologic and geologic data also refute a Miocene river pathway through western Grand Canyon and Grand Wash trough. Thus, Sespe clasts do not require a drainage connection from Grand Canyon or the Colorado Plateau and provide no constraints for the history of carving of Grand Canyon. Instead, abundant evidence refutes the “old” (70–17 Ma) Grand Canyon models and supports a <6 Ma Grand Canyon.

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