Fossil of holes

[SCfossiler]

Not exactly sure what this is, my first thought is a burrow fossil but not sure. Each hole is roughly half a centimeter wide with a grouping of 6 of them. Any ideas? 

Found in Summerville SC stream bed

[ynot]

I would agree with bio eroded stone.

[Tidgy's Dad]

I agree.

It's an interesting pattern but doesn't look biological in origin to me. 

[caldigger]

First attempt at a stone age revolver cylinder?