But at about 20 feet below ground, the doughnut-shaped drill bit attached to a long hollow tube in which the core samples were being collected struck something so impenetrable that the field work came to halt.
I have experienced exactly the same phenomenon, while carrying out my own "research" in the Odessa crater area.
Of course, my equipment was not as sophisticated as the Holliday/Kring/Mayer team (pretty much just a Goldmaster and an army surplus entrenching tool), but my "impenetrable object" turned out to be one of the many old oil pipes that criss-cross the site. I may not have made it *quite* 20 feet down either, but who's counting?
I can relate though : )
Geoff N.
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