Image: Brigham Young UniversityThe just of it:
"The skulls were found in 2005. Tantalized researchers, though, were stymied by rocks around the bones that were so hard that workers were unable to break through, even with use of a jackhammers and concrete saws [Los Angeles Times]."
So they turned to explosives to loosen the rock without damaging the fossils.
Read more here.
Image: Brigham Young University
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