Oh right...that map. Yes, it is also being completed ~soon. I have finally honed-in on a way to make a geologic map out of the voodoo-spaghetti-massacre of linework. Here is a tiny example of the geologic map resulting from alluvial channel change between (only) 1953 and 1976. The legend needs some work. Just wait until I add data from 1985, 1996, 2005, and 2009.