There's plenty of evidence of wear and tear on fossils, and plenty have been eroded out of one age of sediment and redeposited; the are called 'reworked' fossils. There is one case where we think a Jurassic ammonite was fossilised, weathered out and was then eaten by a dinosaur for use as a gastrolith, and after the dinosaur died or coughed it back up it was reburied in the later sediments. Wonderful!