<img src="http://www.treasurenet.com/forums/attachment.php?attachmentid=840394"/>
Looks like what some folks call oolitic , or oolithic. Google search oolithic chert, great find. thanks for the view.
He had the answer pages ago.
Sorry I didn't see that sooner.
Your spots are called oolits.
NC. I think yours are from nuclear radiation!
Damm that's bright.