Including Original "Paul H. Letters" Copyright © 1996-2018 Paul V. Heinrich - All rights reserved.

Friday, 30 November 2012

A 60-Million-Year Debate on Grand Canyon’s Age

A 60-Million-Year Debate on Grand Canyon’s Age

Did Dinosaurs Gawk at the Grand Canyon?
by Phil Berardelli, Science Now, April 28, 2102

A Grand Old Canyon by Sid Perkins , Science
News, November 2012,

A 60-Million-Year Debate on Grand Canyon’s Age
By John N. Wilford, November 29, 2012

Grand Canyon 70 million years old, formed during
era of dinosaurs, new study claims, Washington Post,
November 29, 2012,

Study contends Grand Canyon as old as dinosaur
era by Alicia Chang, November 29, 2012

A Grand Canyon as Old as the Dinosaurs?, Cal Tech

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

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

PDF file at

Another recent paper is:

Longinott, N., nd, Chapter 4: History of the Colorado
River Incision and Formation of the Grand Canyon.

PDF file at

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 or
27 MB PDF file at

Best wishes,

Paul H.