I found this strange Composita subtilita at the Paleo Site bear Kohls Ranch, Arizona. It is from the Middle Pennsylvanian Naco Formation.
Does anyone know what’s going on with the strange pattern?
Flip side
I also should be able to provide slightly higher quality photos if needed, I just reduced the quality to be able to post several
PS-I wasn’t sure if I should post this here since I have an ID, so please move it if it shouldn’t be