What is this strange thing

[foragg]

I have been trying to find out what this is for ages. Any ideas.

 

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[Boomerboom]

To me looks like some type of coral that someone's put a rock in each hole
But I'm not much of a expert at anything really cool no matter what!

 

[PennyG]

Looks a little like lithostrotionella.

 

[P.ALLEN]

I'm not sold on colonial coral just yet, looks like it might have been formed by precipitate, otherwise the cells would have more than a pebble in the middle like appearance, you would see slits and concentric patterning. Dunno, it's cool as heck though

 

[Mackaydon]

Petrified alien egg pods.
Then again,maybe not.
Don..........