Results: 1 - 4 of 4
Mar 14, 2010
Data
… shield where we took rock samples for 40 argon/39 argon …
Mar 14, 2010
Data
… locations where we took rock samples for uranium-lead dating. …
Jan 11, 2012
Map
… and 40 argon/39 argon samples are marked on the map, and …
Dec 31, 1974
Earth Sciences Report
… one third to one half of the samples analyzed exceeded …