Publications
Filter Total Items: 1493
The role of climate and vegetation change in shaping past and future fire regimes in the northwestern US and the implications for ecosystem management The role of climate and vegetation change in shaping past and future fire regimes in the northwestern US and the implications for ecosystem management
Fire is an important part of the disturbance regimes of northwestern US forests and its role in maintaining and altering forest vegetation is evident in the paleoecological record of the region. Long-term reconstructions of Holocene fire regimes, provided by the analysis of charcoal, pollen, and other fire proxies in a network of lake records, indicate that the Pacific Northwest and...
Authors
C. Whitlock, S.L. Shafer, J. Marlon
Quaternary loess-Paleosol sequences as examples of climate-driven sedimentary extremes Quaternary loess-Paleosol sequences as examples of climate-driven sedimentary extremes
No abstract available.
Authors
Daniel R. Muhs, E. Arthur Bettis
Geology of the Right Stepover region between the Rodgers Creek, Healdsburg, and Maacama faults, northern San Francisco Bay region: A contribution to Northern California Geological Society Field Trip Guide, June 6-8, 2003 Geology of the Right Stepover region between the Rodgers Creek, Healdsburg, and Maacama faults, northern San Francisco Bay region: A contribution to Northern California Geological Society Field Trip Guide, June 6-8, 2003
This Open file report was written as part of a two-day field trip on June 7 and 8, 2003, conducted for the Northern California Geological Society. The first day of this field trip (June 7) was led by McLaughlin and Sarna-Wojcicki in the area of the right- step between the Rodgers Creek- Healdsburg fault zone and the Maacama fault. The second day of the trip (June 8), was led by David...
Authors
Robert J. McLaughlin, Andrei Sarna-Wojcicki
Tectonic controls of Mississippi Valley-type lead-zinc mineralization in orogenic forelands Tectonic controls of Mississippi Valley-type lead-zinc mineralization in orogenic forelands
Most of the world's Mississippi Valley-type (MVT) zinc-lead deposits occur in orogenic forelands. We examine tectonic aspects of foreland evolution as part of a broader study of why some forelands are rich in MVT deposits, whereas others are barren. The type of orogenic foreland (collisional versus Andean-type versus inversion-type) is not a first-order control, because each has MVT...
Authors
D. C. Bradley, D. L. Leach
Marine terraces, sea level history and Quaternary tectonics of the San Andreas fault on the coast of California Marine terraces, sea level history and Quaternary tectonics of the San Andreas fault on the coast of California
No abstract available.
Authors
D.R. Muhs, C. Prentice, D.J. Merrits
Last Glacial loess in the conterminous USA Last Glacial loess in the conterminous USA
The conterminous United States contains an extensive and generally well-studied record of Last Glacial loess. The loess occurs in diverse physiographic provinces, and under a wide range of climatic and ecological conditions. Both glacial and non-glacia lloess sources are present, and many properties of the loess vary systematically with distance from loess sources. United States' mid...
Authors
E. Arthur Bettis, Daniel R. Muhs, Helen M. Roberts, Ann G. Wintle
Quaternary stratigraphy, geomorphology, soils, and alpine archaeology in an alpine-to-plains transect, Colorado Front Range Quaternary stratigraphy, geomorphology, soils, and alpine archaeology in an alpine-to-plains transect, Colorado Front Range
No abstract available.
Authors
David P. Dethier, James B. Benedict, Peter W. Birkeland, Nel Caine, P. Thompson Davis, Richard F. Madole, Penny E. Patterson, Alan B. Price, Taylor F. Schildgen, Ralph R. Shroba
Tree-ring dated landslide movements and their relationship to seismic events in southwestern Montana, USA Tree-ring dated landslide movements and their relationship to seismic events in southwestern Montana, USA
To determine periods of incremental landslide movement and their possible relationship to regional seismic events, the tree-ring records of 32 titled and damaged conifers at three sites on landslides in the Gravelly Range of southwestern Montana were examined. Several signs of disturbance in the tree-ring record indicating landslide movement were observed. Commonly, the tree-ring record...
Authors
Paul E. Carrara, J. M. O’Neill
Pliocene to middle Pleistocene lakes in the western Great Basin: Ages and connections Pliocene to middle Pleistocene lakes in the western Great Basin: Ages and connections
No abstract available.
Authors
Marith C. Reheis, Andrei M. Sarna-Wojcicki, Richard L. Reynolds, C. A. Repenning, Martin D. Mifflin
Reply to Discussion on "Mississippi Valley-type lead–zinc deposits through geological time: implications from recent age-dating research" Reply to Discussion on "Mississippi Valley-type lead–zinc deposits through geological time: implications from recent age-dating research"
No abstract available.
Authors
David L. Leach, Dwight Bradley, Michael T. Lewchuk, David T. Symons, Wayne R. Premo, Joyce Brannon, G. De Marsily
Monitoring dust storms and mapping landscape vulnerability to wind erosion using satellite and ground-based digital images Monitoring dust storms and mapping landscape vulnerability to wind erosion using satellite and ground-based digital images
Wind-induced dust emission in the southwestern United States is important regionally because of its impact on human health and safety and its influence on ecosystem dynamics. Factors that control dust emission include wind velocity, sediment availability, and surface conditions (e.g., vegetation type and degree of cover, surface crusts and armoring, and soil moisture - Gillette and Passi...
Authors
Pat S. Chavez, David MacKinnon, Richard L. Reynolds, Miguel G. Velasco
An ENSO predictor of dust emission in the southwestern United States An ENSO predictor of dust emission in the southwestern United States
Here we show that there is a significant relationship between Nino 3.4 ENSO anomaly (Dec–Jan average) and precipitation in the southwestern United States. This contributes to increased frequency of dust events in the years following strong La Niña and El Niño years. High probabilities (60%–100%) exist for an elevated frequency of dust events in years when the ENSO anomaly, annual...
Authors
Gregory S Okin, Marith C. Reheis