Publications
Filter Total Items: 1493
Unusual Holocene and late Pleistocene carbonate sedimentation in Bear Lake, Utah and Idaho, USA Unusual Holocene and late Pleistocene carbonate sedimentation in Bear Lake, Utah and Idaho, USA
Bear Lake (Utah-Idaho, USA) has been producing large quantities of carbonate minerals of varying mineralogy for the past 17,000 years. The history of sedimentation in Bear Lake is documented through the study of isotopic ratios of oxygen, carbon, and strontium, percent organic carbon, percent CaCO3, X-ray diffraction mineralogy, HCl-leach inorganic geochemistry, and magnetic properties...
Authors
W. Dean, J. Rosenbaum, G. Skipp, S. Colman, R. Forester, A. Liu, K. Simmons, J. Bischoff
Developing a bubble number-density paleoclimatic indicator for glacier ice Developing a bubble number-density paleoclimatic indicator for glacier ice
Past accumulation rate can be estimated from the measured number-density of bubbles in an ice core and the reconstructed paleotemperature, using a new technique. Density increase and grain growth in polar firn are both controlled by temperature and accumulation rate, and the integrated effects are recorded in the number-density of bubbles as the firn changes to ice. An empirical model of...
Authors
M. K. Spencer, R. B. Alley, J. J. Fitzpatrick
Proceedings of the 4th New World Luminescence Dating and Dosimetry Workshop, Denver, Colorado, May 31 June 2, 2006 Proceedings of the 4th New World Luminescence Dating and Dosimetry Workshop, Denver, Colorado, May 31 June 2, 2006
Introduction: Optically stimulated luminescence (OSL) is one of a class of measurements known as stimulated phenomena. Such phenomena may be stimulated thermally or optically and the reader is referred to works by Aitken (1998) and Botter-Jensen and others (2003) for more detail. In recent years OSL has become a popular procedure for the determination of environmental radiation doses...
Coalbed Methane Extraction and Soil Suitability Concerns in the Powder River Basin, Montana and Wyoming Coalbed Methane Extraction and Soil Suitability Concerns in the Powder River Basin, Montana and Wyoming
The Powder River Basin is located in northeastern Wyoming and southeastern Montana. It is an area of approximately 55,000 square kilometers. Extraction of methane gas from the coal seams that underlie the Powder River Basin began in Wyoming in the late 1980s and in Montana in the late 1990s. About 100-200 barrels of co-produced water per day are being extracted from each active well in...
Authors
Water Resources Division U.S. Geological Survey
Mapping new terrain climate change and America’s West: Anticipating challenges to western mountain ecosystems and resources Mapping new terrain climate change and America’s West: Anticipating challenges to western mountain ecosystems and resources
Climate variability and sustained change presage far-reaching transformations across America’s West, an expanse dominated by immense mountain ranges and interspersed with important urban centers. These mountains provide the region’s life blood—water that courses through its streams and runs out its faucets, power that fuels its industries and lights its cities, and natural resources that...
Authors
Ice sheets and sea level: response Ice sheets and sea level: response
No abstract available.
Authors
Jonathan T. Overpeck, Bette L. Otto-Bliesner, Gifford H. Miller, Richard B. Alley, Daniel R. Muhs, Shawn J. Marshall
Understanding the spatial heterogeneity of global environmental change in mountain regions Understanding the spatial heterogeneity of global environmental change in mountain regions
One of the challenges for global environmental change research is to understand how future climate changes will be expressed in mountain regions. The physiographic complexity of mountains creates environments that can be highly variable over relatively short distances. This spatial heterogeneity reflects a hierarchy of environmental controls. At regional scales, insolation and...
Authors
Sarah Shafer, Patrick J. Bartlein, Cathy Whitlock
Preliminary geologic map of southernmost Texas, United States, and parts of Tamaulipas and Nuevo Leon, Mexico: Environmental health investigations in the United States-Mexico border region Preliminary geologic map of southernmost Texas, United States, and parts of Tamaulipas and Nuevo Leon, Mexico: Environmental health investigations in the United States-Mexico border region
No abstract available.
Authors
William R. Page, D. Paco VanSistine, Kenzie J. Turner
Stratigraphy and structural history of the eastern edge of the Helena salient, Montana Stratigraphy and structural history of the eastern edge of the Helena salient, Montana
No abstract available.
Authors
Mitchell W. Reynolds
Structural termination of the Montana disturbed belt and its interaction with major structures of the continental autochthon Structural termination of the Montana disturbed belt and its interaction with major structures of the continental autochthon
No abstract available.
Authors
Mitchell W. Reynolds
Laccoliths of the southwest part of the Little Belt Mountains; their relation to ancestral structures of the Central Montana Uplift Laccoliths of the southwest part of the Little Belt Mountains; their relation to ancestral structures of the Central Montana Uplift
No abstract available.
Authors
Mitchell W. Reynolds
Radiocarbon dating of cores collected from Bear Lake, Utah and Idaho Radiocarbon dating of cores collected from Bear Lake, Utah and Idaho
No abstract available.
Authors
Steven M. Colman, Darrell S. Kaufman, Joseph G. Rosenbaum, John P. McGeehin