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Bernhard Peucker-Ehrenbrink collected samples.

Sawing for Samples

Bernhard Peucker-Ehrenbrink used a saw to collect samples of 635-million-year-old rocks from the iridium boundary in a cliff in theHoanib Valley in Namibia.  He is using geochemical tracers todetect the presence of extraterrestrial matter in the rocks.
(Photo by Ricardo Trinidade)


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