No clue

[PennyG]

It was suggested I show this item here to see if a possible identification could be made.
I found it in a creek bed in Eureka Springs Arkansas. I thought it was a rock but on closer inspection there seems to be some sort of outline in one of the pockets.


Also this fossil which is obviously an imprint of something but not sure what. Same location .
Rock to far right.

 

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[Ponchosportal]

Look like just rocks to me.

 

[PennyG]

Look like just rocks to me.

The majority are "just rocks". I was asking about two in particular. The large white one that has sections inside one of the cavities and well the second is obviously a fossil but of what I don't know: That is why I am here.