Publications
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Tertiary cooling and tectonic history of the White River uplift, Gore Range, and western Front Range, central Colorado: Evidence from fission-track and 39Ar/ 40Ar ages
Apatite fission-track (AFT) data from Proterozoic and Paleozoic rocks in the mountains of north central Colorado (White River Uplift, Gore Range, and western Front Range) record significant cooling that began with uplift and erosion related to the Laramide Orogeny and continued through the Tertiary to Pliocene time. The mountains immediately flanking the Blue River half graben (Williams Fork Mount
Authors
C.W. Naeser, Bruce Bryant, Michael J. Kunk, Karl S. Kellogg, R.A. Donelick, W. J. Perry
40Ar/39Ar ages of late Cenozoic volcanic rocks within and around the Carbondale and Eagle collapse centers, Colorado: Constraints on the timing of evaporite-related collapse and incision of the Colorado River
40Ar/ 39Ar dating results of 133 samples from 84 late Cenozoic volcanic rocks provide emplacement ages that constrain the timing of evaporite collapse and the incision rates of the Colorado River. Our samples are from areas in west-central Colorado, both within and outside of the Carbondale and Eagle collapse centers. Significant pulses of volcanic activity occurred in the intervals from 24 to 22,
Authors
Michael J. Kunk, James R. Budahn, D. M. Unruh, Josette O. Stanley, R. M. Kirkham, Bruce Bryant, R. B. Scott, David J. Lidke, R. K. Streufert
Eagle collapse center: Interpretation of evidence for late Cenozoic evaporite-related deformation in the Eagle River basin, Colorado
Evaporite tectonism resulted in deformation and collapse over an area of ~2500 km2 that is referred to as the Eagle collapse center. The collapse center includes much of the Eagle and Colorado River drainage basins between Vail, Dotsero, and McCoy, Colorado. The volume loss of evaporitic rocks by dissolution in the collapse center is estimated to be nearly 1700 km33 . Before ca. 10 Ma, Miocene bas
Authors
David J. Lidke, Mark R. Hudson, R. B. Scott, Ralph R. Shroba, Michael J. Kunk, W. J. Perry, R. M. Kirkham, James R. Budahn, R. K. Streufert, J.O. Stanley, B.L. Widmann
Accumulation and subsidence of the Pleistocene basaltic lava flows of the eastern Snake River Plain, Idaho
No abstract available.
Authors
Duane E. Champion, Marvin A. Lanphere, Steven R. Anderson, Mel A. Kuntz
The last interglacial period on the Pacific Coast of North America: Timing and paleoclimate
New, high-precision U-series ages of solitary corals (Balanophyllia elegans) coupled with molluscan faunal data from marine terraces on the Pacific Coast of North America yield information about the timing and warmth of the last interglacial sea-level highstand. Balanophyllia elegans takes up U in isotopic equilibrium with seawater during growth and shortly after death. Corals from the second terr
Authors
D.R. Muhs, K. R. Simmons, G. L. Kennedy, T. K. Rockwell
The lacustrine carbon cycle as illuminated by the waters and sediments of two hydrologically distinct headwater lakes in north-central Minnesota, U.S.A
The accumulation rates of CaCO3 and organic carbon (OC) in lake sediments are delicately balanced between production in the epilimnion and destruction in the hypolimnion. The cycling of these two forms of carbon makes a "carbon pump" that greatly affects the biogeochemical cycles of other elements. To further understand these biogeochemical dynamics, the lakes, streams, and wetlands of the Shingob
Authors
Walter E. Dean, Antje Schwalb
Evidence for Mississippi Valley-type lead-zinc mineralization in the Cevennes region, Southern France, during Pyrenees orogeny
No abstract available.
Authors
D. Leach, Wayne R. Premo, M. Lewchuk, H. Rouvier, J.-C. Macquar, J. Thibieroz, B. Henry, M. Le Goff
Rb-Sr isotopic systematics of lherzolitic shergottite Yamato-793605
No abstract available.
Authors
N. Morikawa, Keiji Misawa, Gabor Kondorosi, Wayne R. Premo, Mistunobu Tatsumoto, Noboru Nakamura
USGS/NOAA North American packrat midden database; data dictionary
No abstract available.
Authors
Laura E. Strickland, Robert S. Thompson, Katherine H. Anderson
Paleoclimate concepts
Interpretation of paleoclimate records requires an understanding of Earth’s climate system, the causes (forcings) of climate changes, and the processes that amplify (positive feedback) or damp (negative feedback) these changes. Paleoclimatologists reconstruct the history of climate from proxies, which are those characteristics of sedimentary deposits that preserve paleoclimate information. A great
Authors
Richard B. Ally, Joan J. Fitzpatrick, J. Brigham-Grette, Geoffery L. Miller, Daniel R. Muhs, Leonid Polyak
Late Quaternary eolian records of the Americas and their paleoclimatic significance
No abstract available.
Authors
Daniel R. Muhs, Marcelo Zarate
Biodiversity losses: The downward spiral
The dramatic decline of whitebark pine (Pinus albicaulis) populations in the northwestern United States and southwestern Canada from the combined effects of fire exclusion, mountain pine beetles (Dendroctonus ponderosae), and white pine blister rust (Cronartium ribicola), and the projected decline of whitebark pine populations rangewide (Chapters 10 and 11) do not simply add up to local extirpatio
Authors
Diana F. Tomback, Katherine C. Kendall