In a rebroadcast from May 1, 2011, Keith talks geoscience with Melanie Barnes, Senior Research Associate, Igneous Petrology & Geochemistry, Texas Tech University. She talks about the reddish granite ryolite that makes up the Thunderbird formation in the Franklin Mountains which dates back 1.4 billion years. She also talks about studying rock samples with instruments that don't destroy the samples.
Aired Aug. 23, 2015
