Any rock hounds / geologists

[Central Iowa]

The family went for a walk at the lake a couple weeks ago and we came across this I've never seen any rock like it that I remember any idea what it is?

 

[Shovelbuck]

I'm no expert but they look like geodes to me. Cool find!!!!

http://www.geodegallery.com/keokuk.html

 

[Central Iowa]

You know Jay I bet your right!

 

[ironwood]

I was going to say that that it looked like a cave formation of some kind.

 

[Deer Nut]

I would bet geodes also. Cool find! Or maybe Pterodactyl eggs? Tyrannosaurus rex?