"What was causing [Andrew] Gleadow concern was the ability to discriminate genuine as against pseudo tracks in the crystals, the reliability of counting them, and the regimen for plugging the numbers into the age computations."
He eventually came up with a method that he considered bias-free and came up with the 1.8 million year date.
Hurford stated, "I was convinced that his analytical approach was right. But I wasn't convinced that 1.8 was right. I had nailed my colors to the mast of 2.4 and I didn't want to believe 1.8."
Roger Lewin (noted science journalist), Bones of Contention (New York, NY: A Touchstone Book published by Simon & Schuster Inc., 1987), pp. 245-246 citing an interview with the author, Berne, Switzerland, 14 June 1985