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Full-Text Articles in Physical Sciences and Mathematics
Seismic Reflection Study Of Upheaval Dome, Canyonlands National Park, Utah, Z. Kanbur, J. N. Louie, S. Chavez-Perez, G. Plank, D. Morey
Seismic Reflection Study Of Upheaval Dome, Canyonlands National Park, Utah, Z. Kanbur, J. N. Louie, S. Chavez-Perez, G. Plank, D. Morey
Canyonlands Research Bibliography
The origin of Upheaval Dome, in Canyonlands National Park of southeastern Utah, has been a topic of controversy among geologists and planetary scientists. The structure has long been thought to have been created by salt diapirism from the underlying Paradox Formation. Recent studies have suggested that impact could have formed the dome. To test the various hypotheses, we acquired, processed, and interpreted seismic reflection data within and adjacent to the structure. Both conventionally stacked and prestack-migrated images show <100 m relief in the Paradox Formation, contrary to salt diapirism hypotheses. Further, we have identified features within the images typical of impact structures, such as listric normal faults having displacements toward the center of the dome. Deformation occurs in two depth ranges, with the faulting that created the central uplift appearing only above the Hermosa Formation, in the upper 800 m of the structure. The images also suggest limited fracturing of the Hermosa and salt flow in the Paradox Formation, perhaps due to gravitational relaxation of the crater form. Our image of a nearly flat top of the Paradox salt strongly favors an impact origin for Upheaval Dome.
First-Year Movements By Juvenile Mexican Spotted Owls In The Canyonlands Of Utah, D. W. Willey, C. Van Riper
First-Year Movements By Juvenile Mexican Spotted Owls In The Canyonlands Of Utah, D. W. Willey, C. Van Riper
Canyonlands Research Bibliography
We studied first-year movements of Mexican Spotted Owls (Strix occidentalis lucida) during natal dispersal in canyonlands of southern Utah. Thirty-one juvenile Mexican Spotted Owls were captured and radiotracked during 1992-95 to examine behavior and conduct experiments related to the onset of natal dispersal. Juvenile Spotted Owls dispersed from their nest areas during September to October each year, with 85% leaving in September. The onset of movements was sudden and juveniles dispersed in varied directions. The median distance from nest area to last observed location was 25.7 km (range = 1.7-92.3 km). Three of 26 juveniles tracked (11%) were alive after …
Completing Canyonlands, Rober B. Keiter
Completing Canyonlands, Rober B. Keiter
Canyonlands Research Bibliography
Focuses on the proposal to follow the basin that defines the national boundaries of the Canyonlands National Park in Utah. Background of the establishment of the park; Role of the National Park Conservation Association and other environmentalist in advocating the proposal; Factors involved in the completion of the proposal.