Ok so far enough back no fossilized tools, but if the civilization was like ours then would it consider leaving stuff for the future - building repositories of knowledge that would survive a longer time. But probably those 'long range' memorials are not long range enough for the geologic times involved - so my question is, is there a memorial/repository of knowledge we could build that would have a good chance of surviving and being understood as a repository of knowledge until the next civilization?
hmm, didn't see that part although I thought I read pretty closely this time. Maybe Coca-Cola should be written on the moon, at any rate something unmistakable. Although one problem with having it on the moon is you have to get there to get any benefit.
