Publications
Filter Total Items: 1493
From buttes to bowls: Repeated relief inversion in the landscape of the Colorado Piedmont From buttes to bowls: Repeated relief inversion in the landscape of the Colorado Piedmont
Mesas and buttes of the central Colorado Piedmont are composed of at least two distinct rock types, which differ in their cohesiveness and resistance to erosion. The lower parts of the exposed stratigraphic section are poorly cemented, Upper Cretaceous to Middle Eocene sandstones of the Dawson Formation. The caprocks are composed of one or more resistant formations of Late Eocene age...
Authors
M.L. Morgan, Vincent Matthews, F. Gutierrez, J.P. Thorson, Richard F. Madole, P.R. Hanson
Surface-exposure ages of Front Range moraines that may have formed during the Younger Dryas, 8.2 cal ka, and Little Ice Age events Surface-exposure ages of Front Range moraines that may have formed during the Younger Dryas, 8.2 cal ka, and Little Ice Age events
Surface-exposure (10Be) ages have been obtained on boulders from three post-Pinedale end-moraine complexes in the Front Range, Colorado. Boulder rounding appears related to the cirque-to-moraine transport distance at each site with subrounded boulders being typical of the 2-km-long Chicago Lakes Glacier, subangular boulders being typical of the 1-km-long Butler Gulch Glacier, and angular...
Authors
Larry Benson, Richard F. Madole, P. Kubik, Richard R. McDonald
Corrigendum to “Age model for a continuous, ca 250-ka Quaternary lacustrine record from Bear Lake, Utah–Idaho” [Quaternary Science Reviews 25 (2006) 2271–2282] Corrigendum to “Age model for a continuous, ca 250-ka Quaternary lacustrine record from Bear Lake, Utah–Idaho” [Quaternary Science Reviews 25 (2006) 2271–2282]
No abstract available.
Authors
S.M. Colman, D. S. Kaufman, C. Heil, J.W. King, Walter E. Dean, Joseph G. Rosenbaum, R. M. Forester, J.L. Bishcoff, M. E. Perkins, John McGeehin
Sediment geochemical records of productivity and oxygen depletion along the margin of western North America during the past 60,000 years: Teleconnections with Greenland Ice and the Cariaco Basin Sediment geochemical records of productivity and oxygen depletion along the margin of western North America during the past 60,000 years: Teleconnections with Greenland Ice and the Cariaco Basin
Many sediment records from the margins of the Californias (Alta and Baja) collected in water depths between 60 and 1200 m contain anoxic intervals (laminated sediments) that can be correlated with interstadial intervals as defined by the oxygen-isotope composition of Greenland ice (Dansgaard–Oeschger, D–O, cycles). These intervals include all or parts of Oxygen Isotope Stage 3 (OIS3; 60...
Authors
Walter E. Dean
Geology Geology
This map shows the ages and types of rocks that lie at or near the land surface throughout the United States. It does not show surficial materials such as soil and glacial deposits, except where Quartenary sedimentary materials cover extensive areas and obscure underlying bedrock materials. The map is a generalization and simplification of the "Geologic Map of North America," published...
Authors
John C. Reed, Charles A. Bush
Loess records: North America Loess records: North America
No abstract available.
Authors
H.M. Roberts, D.R. Muhs, E. Arthur Bettis
Dune fields: mid-latitudes Dune fields: mid-latitudes
No abstract available.
Authors
Jielun Sun, D.R. Muhs
Loess deposits, origins and properties Loess deposits, origins and properties
No abstract available.
Authors
D.R. Muhs
Atlas of relations between climatic parameters and distributions of important trees and shrubs in North America: Ecoregions of North America Atlas of relations between climatic parameters and distributions of important trees and shrubs in North America: Ecoregions of North America
Climate is the primary factor controlling the continental-scale distribution of plant species, although the relations between climatic parameters and species' ranges are only now beginning to be quantified. This volume examines the relations between climate and the distributions of (1) Kuchler's 'potential natural vegetation' categories for the 48 contiguous States of the United States...
Authors
Robert S. Thompson, Katherine H. Anderson, Richard T. Pelltier, Sarah L. Shafer, Patrick J. Bartlein
Rapid Data Delivery System (RDDS) Rapid Data Delivery System (RDDS)
Since the start of the active 2000 summer fire season, the U. S. Geological Survey (USGS) Rocky Mountain Geographic Science Center (RMGSC) has been actively engaged in providing crucial and timely support to Federal, State, and local natural hazards monitoring, analysis, response, and recovery activities. As part of this support, RMGSC has developed the Rapid Data Delivery System (RDDS)...
Authors
Jill J. Cress, Susan E. Goplen
Global Data Toolset (GDT) Global Data Toolset (GDT)
According to the United Nations Environment Programme World Conservation Monitoring Centre (UNEP-WCMC) approximately 60 percent of the data contained in the World Database on Protected Areas (WDPA) has missing or incomplete boundary information. As a result, global analyses based on the WDPA can be inaccurate, and professionals responsible for natural resource planning and priority...
Authors
Jill J. Cress, Jodi L. Riegle