There is a serious mistake in Dr. Hammer's paper. Figure 8 shows upward continued land gravity compared to land-observed gravity and a helicopter gravity profile over the Big Hill and High Island Salt Domes. The upward continued curve is wrong and seriously misleading.
Two years ago I pointed this problem out to Dr. Hammer after his presentation at the Annual Meeting in Los Angeles, and I was not alone in recognizing this error. Thus I am very disappointed to see the same erroneous curve published in the Journal.