Zobrazeno 1 - 10
of 62
pro vyhledávání: '"Ivo Lucchitta"'
Publikováno v:
Geosphere. 17:1704-1714
The timing of integration of the Colorado River system is central to understanding the landscape evolution of much of the southwestern United States. However, the time at which the Colorado River started incising the westernmost Grand Canyon (Arizona
Autor:
Ivo Lucchitta, Richard F. Holm
Publikováno v:
Geosphere. 16:533-545
An ancient drainage, named Crooked Ridge river, is unique on the Colorado Plateau in extent, physiography, and preservation of its alluvium. This river is important for deciphering the generally obscure evolution of rivers in this region. The ancient
Publikováno v:
Geological Society of America Abstracts with Programs.
Publikováno v:
Geosphere. 9:1417-1433
The southwesterly course of the probably pre–early Miocene and possibly Oligocene Crooked Ridge River can be traced continuously for 48 km and discontinuously for 91 km in northern Arizona (United States). The course is visible today in inverted re
Publikováno v:
GSA Today. 21:4-10
Publikováno v:
Quaternary Research. 53:23-33
In the western Grand Canyon, fluvial terraces and pediment surfaces, both associated with a Pleistocene basalt flow, document Quaternary aggradation and downcutting by the Colorado River, illuminate the river's response to overload and the end of ove
Publikováno v:
Geoarchaeology. 15:783-798
Abandoned fields in Colorado River alluvium in the eastern Grand Canyon show signs of primitive agriculture. Presence of maize pollen in association with buried soils near Comanche Creek suggests that farming began prior to 3130 yr B.P. Cotton pollen
Autor:
Karl E, Karlstrom, John, Lee, Shari, Kelley, Ryan, Crow, Richard A, Young, Ivo, Lucchitta, L Sue, Beard, Rebecca, Dorsey, Jason W, Ricketts, William R, Dickinson, Laura, Crossey
Publikováno v:
Science (New York, N.Y.). 340(6129)
Flowers and Farley (Reports, 21 December 2012, p. 1616; published online 29 November 2012) propose that the Grand Canyon is 70 million years old. Starkly contrasting models for the age of the Grand Canyon-70 versus 6 million years-can be reconciled b
Autor:
Ivo Lucchitta, Neil Suneson
Publikováno v:
Geological Society of America Bulletin. 105:1346-1356
Plots of dip measurements taken from syntectonic deposits in extended terranes provide a simple and useful technique that can help to unravel complex deformation histories. In the Castaneda Hills-Signal area of west-central Arizona, dip analysis has