No idea - they look hollow, are they? Seem kinda big for bingo and it's interesting that there appear to be six impressions on each. Children's Alphabet toys maybe?
If I remember right, I won it in 2011 at the auction which used to be held during the WVMCC Show to benefit the Club - I think Dave McCullough may have donated it to the auction. @wvrons might be able to correct me if I am wrong - his memory seems to be working better than mine lately. 😄
That is unusual - really cool. Of course, there are some limestone deposits that are chock-full of fossils. It's almost surprising marbles like this aren't more common. But this is the first one I have seen.
It kinda makes all the other limestone marbles seem lame - the best I have are dyed - big whoop! lol