Weird Blue fossils I found in Missouri

[Samurai]

Location is in Missouri

The area is dated to the Pennsylvanian 

most likely Raytown, Wyandotte Limestone Formation

 

At this pile I hunt at there are many concretions, but none exude the blue coloring as they are mostly black and much smaller. I am not 100% sure these are fossils but these are the only weirdly hued fossils I have found there. 

 

 I have found a few teeth from Eugeneodontida, Horn corals, Crinoids, Brachiopods, Nautiloids and petrified wood from the area. 

 

 

I do not have any measuring tools that are not wood when I took these pictures.

I apologize and hope this could be a decent size reference.

 

[Coco]

Hi,

 

If you don’t want to take your rule to the field, I advise you to make one on cardboard and use it on the way out. This isn't very complicated to do, and I admit that like probably many other TFF members, I will not compare your tool size images with the size of your fossils.

 

Coco

[Samurai]

8 minutes ago, Coco said:

Hi,

 

If you don’t want to take your rule to the field, I advise you to make one on cardboard and use it on the way out. This isn't very complicated to do, and I admit that like probably many other TFF members, I will not compare your tool size images with the size of your fossils.

 

Coco

Thanks for the response, I never thought of that way and will do that in the future. 

 

I thought it was a good idea to include a size reference for those more inclined 

[Rockwood]

I think copper compounds are often responsible for the color blue.