A 60-Million-Year Debate on Grand Canyon’s Age
Did Dinosaurs Gawk at the Grand Canyon?
by Phil Berardelli, Science Now, April 28, 2102http://news.sciencemag.org/sciencenow/2008/04/11-01.html
A Grand Old Canyon by Sid Perkins , Science
News, November 2012,
http://news.sciencemag.org/sciencenow/2012/11/a-grand-old-canyon.html
A 60-Million-Year Debate on Grand Canyon’s Age
By John N. Wilford, November 29, 2012
http://www.nytimes.com/2012/11/30/science/earth/study-sees-older-grand-canyon-stirring-controversy.html
Grand Canyon 70 million years old, formed during
era of dinosaurs, new study claims, Washington Post,
November 29, 2012,
http://www.washingtonpost.com/national/health-science/grand-canyon-70-million-years-old-formed-during-era-of-dinosaurs-new-study-claims/2012/11/29/5788b9d0-3a45-11e2-b01f-5f55b193f58f_story.html
Study contends Grand Canyon as old as dinosaur
era by Alicia Chang, November 29, 2012
http://www.huffingtonpost.com/huff-wires/20121129/us-sci-grand-canyon-age/?utm_hp_ref=media&ir=media
A Grand Canyon as Old as the Dinosaurs?, Cal Tech
http://www.caltech.edu/content/grand-canyon-old-dinosaurs
The paper is:
Flowers, R. M., and K. A. Farley, 2012, Apatite 4He/3He
and (U-Th)/He Evidence for an Ancient Grand Canyon.
Science Express, Published Online November 29 2012
Science DOI: 10.1126/science.1229390
http://www.sciencemag.org/content/early/2012/11/28/science.1229390
A recent paper about the "California River" is:
Wernicke, B., 2011, The California River and its role in
carving Grand Canyon. Geological Society of America
Bulletin. vol. 123, no. 7-8, pp. 1288-1316.
Abstract at
http://gsabulletin.gsapubs.org/content/early/2011/01/26/B30274.1
PDF file at
http://www.geo.umass.edu/structure/StrSem/Werneckie-GSABull-InPresJan2011-Canyon.pdf
Another recent paper is:
Longinott, N., nd, Chapter 4: History of the Colorado
River Incision and Formation of the Grand Canyon.
PDF file at
https://www.geology.ucdavis.edu/~shlemonc/trips/grandcanyon_12/bigpicture/Ch4_GC_incision.pdf
and https://www.geology.ucdavis.edu/~shlemonc/trips/grandcanyon_12/index.html
Finally, there is:
Beard, L. S., K. E. Karlstrom, R. A. Young, and G. H.
Billingsley, eds., 2011, CRevolution 2—Origin and
evolution of the Colorado River system, workshop
abstracts: U.S. Geological Survey Open-File Report
2011–1210, 300 p.,
Available at either http://pubs.usgs.gov/of/2011/1210/ or
27 MB PDF file at http://pubs.usgs.gov/of/2011/1210/of2011-1210.pdf
Best wishes,
Paul H.
