Technical Comments

Response to Comments on “Apatite 4He/3He and (U-Th)/He Evidence for an Ancient Grand Canyon”

Science  12 Apr 2013:
Vol. 340, Issue 6129, pp. 143
DOI: 10.1126/science.1234203

You are currently viewing the abstract.

View Full Text

Abstract

We reiterate that geological observations do not require Grand Canyon carving coeval with Colorado River integration. (U-Th)/He data from the western canyon, totaling 29 reproducible analyses from six samples and two labs, compellingly support an ancient canyon. Three dispersed analyses from one anomalous sample do not refute this conclusion, nor do the claimed shortcomings of our modeling have validity.

View Full Text