This is the kind of thing we get up to at ours on a sick day. It was quite amusing actually. My parents were over, myself and Ella. All of us were focussed on Ella chipping away at this lump of stuff trying to find and then uncover the two fossils hidden within. You should have seen the itching fingers on all of the adults, just dying to have a turn.
Within, a rock with a fancy name I can't recall and a shark tooth. That was about an hour of fun.