Well, I said he was a geologist, not a mathematician. All that aside, I agree with him. Even if I allow for all of your calculations (and I have no idea where you got your numbers), and even if I agree that long-lived animals could diverge so quickly (I don't; you can ask me about the reasons for this, if you like), and even if I agreed that 269 boxcars would be sufficient for the food alone (on very meager rations, to be sure), and even if I thought that space could be used that efficiently (there is no engineering project in existence, to date, that does), and even if I allowed that a ship of those dimensions in the shape required to allow that kind of efficiency could float on a large body of water (it couldn't), there are still weaknesses: 1. There were 7 (possibly 7 pairs) of each clean animal. 2. What about dinosaurs? 2a. Did they still exist? 2b. If not, how did they all die before the flood? 3. How did the animals distribute themselves across the (now) divided globe in that time frame?