J K Davis, Mark R. Hudson, V.J.S. Grauch,
... estimates from 3He cosmogenic nuclide dating of Lake Alamosa and Rio Grande Gorge landforms. As such, our analyses suggest ... San Luis Valley likely became incorporated into the Rio Grande approximately 376 ka. Local, shallower lake systems appear to have existed at the well site until about 250 ka. This may corroborate the results of previous works that propose the drainage of Lake Alamosa began about 400 ka and was ultimately finished ...
Tópico(s): Tree-ring climate responses
2017 - University of Wyoming | Rocky Mountain geology
Viki Bankey, V.J.S. Grauch, Ank Webbers, Inc PRJ,
... large parts of the San Luis Valley in Alamosa, Conejos, Costilla, and Rio Grande Counties, southern Colorado, and the Taos Plateau ...
Tópico(s): Seismic Waves and Analysis
2005 - United States Department of the Interior | Antarctica A Keystone in a Changing World
Chester A. Ruleman, Theodore R. Brandt,
... cutting through the San Luis Hills, carving the Rio Grande gorge, and ultimately flowing into the Gulf of Mexico. This surficial geologic map of the northern San Luis Valley, paired with the Alamosa, CO 1:100,000-scale geologic map (U. ...
Tópico(s): Geology and Paleoclimatology Research
2021 - United States Geological Survey | Scientific investigations map
Brian S. Brister, Robbie Gries,
... of borehole and reflection seismic data from the Alamosa basin (northern San Luis Basin, Rio Grande rift) reveals tectonic development in response to ...
Tópico(s): Hydrocarbon exploration and reservoir analysis
1994 - Geological Society of America | Geological Society of America Special Papers
Clait E. Braun, Sara J. Oyler‐McCance, Jennifer A. Nehring, Michelle L. Commons, Jessica R. Young, Kim M. Potter,
... the large expanse of the San Luis Valley (Alamosa, Conejos, Costilla, and Rio Grande counties) was minimal and mostly on the ...
Tópico(s): Botany, Ecology, and Taxonomy Studies
2014 - Wilson Ornithological Society | The Wilson Journal of Ornithology
Chester A. Ruleman, Adam M. Hudson, Ren A. Thompson, Daniel P. Miggins, James B. Paces, Brent M. Goehring,
... dating of shoreline deposits of closed basin Lake Alamosa and fluvially scoured bedrock along the Rio Grande gorge rim indicate the San Luis basin was connected with southerly Rio Grande basins and progressively incised since ∼400 ka. Waning tectonic activity, coupled with the hydrologic response to intensified middle Pleistocene glaciation, drove southward spillover of Lake Alamosa ∼400 ka, expanding the river's drainage basin ...
Tópico(s): Landslides and related hazards
2019 - Elsevier BV | Quaternary Science Reviews
Cal Ruleman, Mark D. Mitchell, Kenzie J. Turner, Harrison J. Gray, Shannon A. Mahan,
Tópico(s): Botany, Ecology, and Taxonomy Studies
2019 - Geological Society of America | Abstracts with programs - Geological Society of America
Marisa Repasch, Karl E. Karlstrom, M. T. Heizler, Mark Pecha,
... Mountains until the ~ 440 ka spillover of Lake Alamosa in south-central Colorado, and we view this event as a re-integration, not initial integration, of upper Rio Grande drainage. Progressive downward integration of Rio Grande ...
Tópico(s): Geological formations and processes
2017 - Elsevier BV | Earth-Science Reviews
Ren A. Thompson, Ralph R. Shroba, Michael N. Machette, Christopher J. Fridrich, Theodore R. Brandt, Michael A. Cosca,
... Denver, CO 80225http://gec.cr.usgs.gov/ The Alamosa 30'× 60' quadrangle is located in the central San Luis Basin of southern Colorado and is bisected by the Rio Grande. The Rio Grande has headwaters in the ...
Tópico(s): Geology and Paleoclimatology Research
2015 - United States Geological Survey | Scientific investigations map
Michael N. Machette, Mary-Margaret Coates, Margo Johnson,
... the San Luis Hills, including evidence for Lake Alamosa and the 1.0 Ma Mesita volcano, and wrap up the trip's third day in the Costilla Plain and Sunshine Valley reviewing alluvial stratigraphy, the history of the Rio Grande, and evidence for young movement on the ... the Bachus pit, about 3 miles southwest of Alamosa. For the final night (after day 2), we will bed down at La Junta Campground at the Bureau of Land Management (BLM) Wild and Scenic Rivers State Recreation Area, west of Questa, New Mexico, overlooking a majestic canyons of the Rio Grande and Red River. This is the 48th ...
Tópico(s): Archaeology and Natural History
2007 - United States Department of the Interior | Antarctica A Keystone in a Changing World
Karel L. Rogers, E. E. Larson, G. M. Smith, Danny Katzman, Gerald R. Smith, Thure E. Cerling, Yang Wang, Richard G. Baker, Kyger C. Lohmann, Charles A. Repenning, Penny E. Patterson, Gerald L. Mackie,
Sediments of the Alamosa Formation spanning the upper part of the Gauss and most of the Matuyama Chrons were recovered by coring in the high (2300 m) San Luis Valley of south-central Colorado. The study site is located at the northern end of the Rio Grande rift. Lithologic changes in the core sediments provide evidence of events leading to integration of the San Luis ...
Tópico(s): Botany, Ecology, and Taxonomy Studies
1992 - Elsevier BV | Palaeogeography Palaeoclimatology Palaeoecology
Thomas F. Turner, Alexander C. Cameron, Megan J. Osborne, David L. Propst,
... related to a central Rio Grande population in Alamosa Creek, and part of the monophyletic Rio Grande lineage. Another disjunct population, Bluewater Creek in ...
Tópico(s): Genetic and phenotypic traits in livestock
2022 - Southwestern Association of Naturalists | The Southwestern Naturalist
Richard F. Madole, Joe H. Romig, John N. Aleinikoff, D. Paco VanSistine, E. Y. Yacob,
... than the late Pleistocene flood plain of the Rio Grande (the most widely accepted hypothesis). A second principal finding is that the Great Sand Dunes are older than late Pleistocene. They postdate the draining of Lake Alamosa, which began ∼ 440 ka, and predate the time ...
Tópico(s): Hydrology and Sediment Transport Processes
2007 - Elsevier BV | Geomorphology
... Arkansas Valley are en echelon segments of the Rio Grande trough that are constricted and faulted south of Salida at the northern end of the Sangre de Cristo Range. Great movements on the bounding faults during Neogene time are indicated by clastic and volcanic trough fill, which may be 10,000 m thick near Alamosa and 1,500 m thick near...
Tópico(s): Geological formations and processes
1975 - Geological Society of America | Memoir - Geological Society of America
Daniel Carver, Jared M. Beeton,
... within the Hot Creek, La Jara Creek, and Alamosa River drainage basins in the San Juan Mountains ... period seen at both Hot Creek and the Alamosa River begins ~ 3300 to 3200 cal yr BP. ... followed by alluvial fan aggradation occur in the Alamosa River basin ~ 2200 cal yr BP. A period ...
Tópico(s): Landslides and related hazards
2014 - Cambridge University Press | Quaternary Research
... Hansen Bluff on the eastern edge of the Alamosa National Wildlife Refuge. The blue clay is a ... to the east and the floodplain of the Rio Grande to the west.
Tópico(s): Seismic Waves and Analysis
2017 - United States Geological Survey | Data series
Michael N. Machette, Ren A. Thompson, Theodore R. Brandt,
... associated with the high-water stand of Lake Alamosa, a Pliocene to middle Pleistocene lake that occupied the San Luis basin prior to its overflow and cutting of a river gorge through the San Luis Hills. After the lake drained, the Rio Grande system included Colorado drainages for the first ... water flow paths in and adjacent to the Rio Grande system. The map abuts U.S. Geological Survey Open File Report 2005-1392 (a map of the northwestern part of the Alamosa 30' x 60' quadrangle map) to the west ...
Tópico(s): Geology and Paleoclimatology Research
2008 - United States Department of the Interior | Antarctica A Keystone in a Changing World
Joseph A. Grim, Yongxin Zhang, David Gochis,
... with MRMS used in areas observed by the Alamosa radar. Emphasis is placed on analyzing the impact of the radar quantitative precipitation estimate on total seasonal runoff in the Conejos River basin and overall runoff throughout the Upper Rio Grande River basin in southern Colorado.
Tópico(s): Meteorological Phenomena and Simulations
2023 - Frontiers Media | Frontiers in Earth Science
Sediments of the Alamosa Formation spanning the upper part of the Gauss and most of the Matuyama Chrons were recovered by coring in the high (2300 m) San Luis Valley of south-central Colorado. The study site is located at the northern end of the Rio Grande rift. Lithologic changes in the core sediments provide evidence of events leading to integration of the San Luis ...
Tópico(s): Marine Biology and Ecology Research
1989 - Elsevier BV | Quaternary Science Reviews
... the tenthredinid (lepidopterous?) leaf-miners,* in the Canada Alamosa, northern Sierra county, N. Mex., in June, 1892, there were also found speciemns of a very distinct leaf-miner. It bears of striking resemblance to the leafminer of the vine found in the Mesilla valley of the Rio Grande. It possesses the sucker-like mouth of ...
Tópico(s): Forest Insect Ecology and Management
1893 - Cambridge University Press | The Canadian Entomologist