I met Dave at an AAPG sectional meeting and after researching work he had done on several oil exploration projects that had been published, we arranged for him to examine a feature that we had an interest in that had similarities to work he had done for a client on the Ames Crater in Oklahoma.  The detailed work shows that his expertise in the use of satellite and aerial -photographic projects is the most professional work that we have ever encountered. -G.P.