I think this ones a fossil....:)

[curious kat]

Found this nodule in the yard with these two spots on the broken side, it's about the size of a silver dollar...what do you guys think?

Thanks!

 

[Ninjafossils]

Not entirely sure. The interior section resembles petrified wood

 

[curious kat]

...petrified wood Ninjafossils, don't know if it is? Someone told me it looks like "rugose coral"...know anything about that?

 

[Harry Pristis]

Your informant, kat, was probably thinking "solitary coral." There are two major divisions of corals, RUGOSA and TABULATA. Many, if not all, solitary corals are rugosids; but, not all rugosids are solitary.

I cannot detect a radiating pattern that would indicate that these are cross-sections of solitary corals. Maybe you can see better with some magnification. My best guess at this point is that these are mineral inclusions.

 

[curious kat]

Hi Harry, always nice to have you pop in! Oh...so minerals, OK....when I looked at the pics of the solitary coral (rugosa) they sort of looked like it, but guess only "sorta" lol....still learning! Thank you for the lesson.