I'm sorry, but how can anyone really believe that these pre-date the creation of the planet? Was anyone THERE at THAT TIME to OBSERVE exactly when and by whom the footprints were made? Seems pretty silly to me to believe in this non-obervational "science"!
You appear to be proceeding on the assumption that direct observation is the only reliable method of determining truth. By this standard, I must infer that you do not believe in God, since you have certainly never directly observed Him. Yes?