Zobrazeno 1 - 10
of 30
pro vyhledávání: '"R. Randall Schumann"'
Autor:
Laura E. Strickland, Robert S. Thompson, Sarah L. Shafer, Patrick J. Bartlein, Richard T. Pelltier, Katherine H. Anderson, R. Randall Schumann, Andrew K. McFadden
Publikováno v:
Scientific Data, Vol 11, Iss 1, Pp 1-26 (2024)
Abstract Plant macrofossils from packrat (Neotoma spp.) middens provide direct evidence of past vegetation changes in arid regions of North America. Here we describe the newest version (version 5.0) of the U.S. Geological Survey (USGS) North American
Externí odkaz:
https://doaj.org/article/a5987f7afbcd47c9b77a3afb1a826455
Publikováno v:
Palaeogeography, Palaeoclimatology, Palaeoecology. 610:111328
Autor:
R. Randall Schumann, Jeffrey S. Pigati
Publikováno v:
Journal of Quaternary Science. 34:499-508
Publikováno v:
Geological Society of America Abstracts with Programs.
Autor:
E. Arthur Bettis Iii, Gary L. Skipp, Daniel R. Muhs, Helen M. Roberts, R. Randall Schumann, Lindsey T. Groves
Publikováno v:
Geological Society of America Abstracts with Programs.
Autor:
R. Randall Schumann, Naomi Porat, Stephen B. DeVogel, Gary L. Skipp, Daniel R. Muhs, Jeffrey S. Pigati
Publikováno v:
Palaeogeography, Palaeoclimatology, Palaeoecology. 491:38-76
Along most of the Pacific Coast of North America, sand dunes are dominantly silicate-rich. On the California Channel Islands, however, dunes are carbonate-rich, due to high productivity offshore and a lack of dilution by silicate minerals. Older sand
Autor:
Lindsey T. Groves, Daniel R. Muhs, Kathleen R. Simmons, R. Randall Schumann, Christopher Florian
Publikováno v:
Geomorphology. 389:107826
Glacial isostatic adjustment (GIA) models hypothesize that along coastal California, last interglacial (LIG, broadly from ~130 to ~115 ka) sea level could have been as high as +11 m to +13 m, relative to present, substantially higher than the commonl
Publikováno v:
Applied Geochemistry. 78:363-379
Comprehensive sampling of peat, underlying lakebed sediments, and coexisting waters of a naturally uraniferous montane wetland are combined with hydrologic measurements to define the important controls on uranium (U) supply and uptake. The major sour
Autor:
Jeffrey S. Pigati, R. Randall Schumann
Publikováno v:
Geomorphology. 301:144-146
We appreciate the thoughtful discussion offered by Pinter et al. (2017) because it gives us an opportunity to elucidate some of the main points of our study, address some apparent misinterpretations, and recapitulate one of our conclusions. Pinter et
Autor:
Timothy A. Pearce, R. Randall Schumann, Kathleen R. Simmons, Gary L. Skipp, Jeffrey S. Pigati, Daniel R. Muhs
Publikováno v:
Geological Society of America Abstracts with Programs.