 | | Report (issue) | | of the Cambrian_________________________ _ Grand Canyon area ___________________________________________________...___________________________________________ _ Mua v Limestone --------------------------------------------·---Four...------Kaibab Limestone ------------------------------------------------------ Cl 2 2 2 3 4 4 4 5...rocks-Continued Southwestern area-Continued Kaibab Limestone--Continued Beta Member ----------------------...--------------------------------------Monument Valley area______________________________________________________ |  | Karlstrom, Karl E., Lee, John P., Kelley, Shari A., Crow, Ryan S., Crossey, Laura J., Young, Richard A., Lazear, Greg, Beard, L. Sue, Ricketts, Jason W., Fox, Matthew, Shuster, David L. (2014) Formation of the Grand Canyon 5 to 6 million years ago through integration of older palaeocanyons. Nature Geoscience, 7 (3) 239-244 doi:10.1038/ngeo2065 | Journal (article/letter/editorial) | | | DOI: 10.1038/NGEO2065 Formation of the Grand Canyon 5 to 6 million years ago through integration of...formation of the Grand Canyon, USA, is vigorously debated. In one view, most of the canyon was carved by the...past 5–6 million years. Alternatively, the Grand Canyon could have been cut by precursor rivers in the...formation of four out of five segments of the Grand Canyon, using apatite fission-track dating, track-length...helium dating: if any segment is young, the old canyon hypothesis is falsified. We reconstruct the thermal |  | | Journal (article/letter/editorial) | | Geographical Society A Boat Voyage through the Grand Canyon of the Colorado Author(s): Claude H. Birdseye and... Moore Source: Geographical Review, Vol. 14, No. 2 (Apr., 1924), pp. 177-196 Published by: American Geographical...I924 VOYAGE THROUGH THE GRAND OF THE COLORADO 2 CANYON BY CLAUDE H. BIRDSEYE and RAYMOND C. MOORE* U...interesting field than the Grand Canyon of the Colorado. The Grand Canyon was discovered in I540 by one...unknown or in doubt. HISTORY OF EXPLORATION The canyon was first really explored in I869, by Major Tohn |  | Wilshire, H.G., Meyer, C.E., Nakata, J.K., Calk, L.C., Shervais, J.W., Nielson, J.E., Schwarzman, E.C. (1985) Mafic and ultramafic xenoliths from volcanic rocks of the western United States. Open-File Report Vol. 1985 (85-139) US Geological Survey doi:10.3133/ofr85139 | Report (issue) | | Nielson 1 , and E.G. Schwarzman 1 Menlo Park, California 9^025 2 Woods Hole, Massachusetts 025^3 , Columbia...major tectonic province from the Coast Ranges in California to the Great Plains. Xenoliths from 68 localities...other groups of interrelated inclusions comprise (2) gabbroids; (3) metagabbroids; (4) spinel peridotite...garnetiferous ultramafic group. Relative abundances of groups 2-8 vary from locality to locality, but in general peridotite...amphibole ("basaltic hornblende"), and biotite from San Carlos, Arizona (also called Rice Station and Peridot |
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