Odd rock inclusions

[littleneckhalfshell]

I was looking for my daughter's dog which ran off the other day and came across a couple of rocks that had some very odd looking inclusions, Rock is some type of sedementary, shale or sandstone is common in the area. The inclusions are roughly the size of a nickle coin and are of a grey almost metalic luster with some little spots or rays that seem to shine in the copper gold color zone. I took a couple of pictures which I hope I can attach. I also grabbed some flakes I was able to pry off with my fingernail, but not sure how to test them or what to test them for. In a fanciful way, it could almost look like someone fired some lead bullets into the rock, but on closer inspection it does not appear to be the case. Could they be some kind of fossile? or something more valuable?