RT Journal Article SR Electronic T1 Deep Holes Yielding Geoscience Surprises JF Science JO Science FD American Association for the Advancement of Science SP 468 OP 470 DO 10.1126/science.245.4917.468 VO 245 IS 4917 A1 KERR, RICHARD A. YR 1989 UL http://science.sciencemag.org/content/245/4917/468.abstract AB