What is this? #3

[Ima Surchin]

Location: Sweetwater, TX

[Rockwood]

Sorry, but I'm afraid that's strike three. I don't see a fossil here.

[Ima Surchin]

What about petrification? I know I came across a cove of turtles. 

[Ima Surchin]

[Rockwood]

You have to eliminate the possibility of this texture/color being iron stained travertine. It's common in places where rocks are found in piles and there is poor air circulation.