Water worn echinoid

[MSirmon]

Found what I believe is a water worn echinoid on bank of the Concho River near San Angelo TX. I believe this is the San Angelo formation. Thoughts? 

[Coco]

Can't see something. Are you able to see on the top of that a star with 5 arms ?

 

Coco

[MSirmon]

[Guguita2104]

Interesting,

I really think this  is an irregular sea urchin.However, it would be easier if you removed some matrix/sediments that are still attached to it.

Regards,

[erose]

Could be the ubiquitous Coenholectypus sp. Fairly common in many of the Texas Cretaceous formations. Problem is the camera is focusing on the surface it is sitting on, not the fossil itself.

 

[MSirmon]

 I'm going to try to remove some of the matrix and then put it on a more neutral background to see if I can get a better photo. 

[MSirmon]

I have cleaned some of the matrix out but am unsure how much further I should try to go. Also think these pictures are a little clearer.

[sixgill pete]

After looking at the new pictures, I think it is an extremely worn echinoid. Enlarging and then cropping the photo of the top side I believe I can see faint petal outlines. But, it is way to worn to even attempt an ID. Keep looking, a good quality one is out there somewhere.

 

[Coco]

OK for sea urchin : we can see on MSirmon's last pic the periproct and the peristom...

Coco

[erose]

It is an urchin. Look up: Coenholectypus planatus.  Fairly common in the Trinity and Fredericksberg Groups.

[abyssunder]

No doubt, it's an echinoid.

[MSirmon]

Thank you all