Paleovegetation and paleo-pedogenic properties from the upper Miocene Coffee Ranch fossil site in the North American Great Plains

Author(s):  
William E. Lukens ◽  
David.L. Fox
Author(s):  
M.R. Miller ◽  
P.L. BROWN ◽  
J.J. DONOVAN ◽  
R.N. BERGATINO ◽  
J.L. SONDEREGGER ◽  
...  

2019 ◽  
Vol 8 (1) ◽  
pp. 22 ◽  
Author(s):  
Hailey Wilmer ◽  
Lauren Porensky ◽  
María Fernández-Giménez ◽  
Justin Derner ◽  
David Augustine ◽  
...  

In the North American Great Plains, multigenerational ranches and grassland biodiversity are threatened by dynamic and uncertain climatic, economic, and land use processes. Working apart, agricultural and conservation communities face doubtful prospects of reaching their individual goals of sustainability. Rangeland research could serve a convening platform, but experimental studies seldom involve local manager communities. The Collaborative Adaptive Rangeland Management (CARM) project, however, has undertaken a ten-year, ranch-level, participatory research effort to explore how community-engaged research can increase our understanding of conservation and ranching goals. Using ethnographic data and the nature-culture concept—which recognizes the inseparability of ecological relationships that are shaped by both biological and social processes—we examine the CARM team’s process of revising their management objectives (2016–2018). In CARM’s early days, the team established locally-relevant multifunctional goals and objectives. As team members’ understanding of the ecosystem improved, they revised objectives using more spatially, temporally and ecologically specific information. During the revision process, they challenged conventional ecological theories and grappled with barriers to success outside of their control. The emerging CARM nature-culture, based on a sense of place and grounded in hope, provides insights into effective community-engaged research to enhance rangeland livelihood and conservation outcomes.


Geology ◽  
2020 ◽  
Vol 48 (3) ◽  
pp. 273-277 ◽  
Author(s):  
Majie Fan ◽  
Ran Feng ◽  
John W. Geissman ◽  
Christopher J. Poulsen

Abstract The relative roles of tectonics and global climate in forming the hydroclimate for widespread eolian deposition remain controversial. Oligocene loess has been previously documented in the interior of western United States, but its spatiotemporal pattern and causes remain undetermined. Through new stratigraphic record documentation and data compilation, we reveal the time transgressive occurrence of loess beginning in the latest Eocene in the central Rocky Mountains, that expands eastward to the Great Plains across the Eocene-Oligocene transition (EOT). Our climate simulations show that moderate uplift of the southern North America Cordillera initiated drying in the Cordilleran hinterland and immediate foreland, forming a potential dust source and sink, and global cooling at the EOT expanded the drying and eolian deposition eastward by causing retreat of the North American Monsoon. Therefore, the eolian deposition reflects continental aridification induced both by regional tectonism and global climate change during the late Paleogene.


Geology ◽  
2007 ◽  
Vol 35 (2) ◽  
pp. 159 ◽  
Author(s):  
Lee Nordt ◽  
Joseph von Fischer ◽  
Larry Tieszen

1988 ◽  
Vol 148 (3-4) ◽  
pp. 299-307 ◽  
Author(s):  
Malcolm J. Drury

1981 ◽  
Vol 4 (1-3) ◽  
pp. 115-141 ◽  
Author(s):  
M.R. Miller ◽  
P.L. Brown ◽  
J.J. Donovan ◽  
R.N. Bergatino ◽  
J.L. Sonderegger ◽  
...  

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