I suppose the real answer lies in the fact that the folks back at the finish FORGOT about me and started shutting equipment down right as I arrived. They saw me and restarted music, but apparently the sensor didn't kick on. One of the officials went to check it and assured me that they "had me," but alas, I only have a split time (3:09) and an empty spot for time and pace.
Kinda sad, as I'll never know my official time -- but fun in that someone checking results sees MY name right above the 1st place finisher (who, by the way, finished the race 12 minutes and 1 second before I reached the halfway point!). And I learned that there were only 320 finishers. And as I don't actually have a ranking, my buddy Judy (not Judi, as I spelled it before) is officially dead last, having arrived at the finish shortly before me =0)