Fossilized skin?

[Callahan]

Found some weird textured rock and some shark teeth where I found big vertebrae which k believe is in woodbine formation.

 

any ideas if this is skin etc?

 

more than likely just fossilized cracked mud. 
 

but thought I would see.  I found shark teeth in immediate area also. 
 

think someone posted on here the teeth I found pretty much with this patterned rock or fossil were saw tooth shark. 

[Fossildude19]

Looks more like counter septarian structures in/on some sort of concretion.

 

 

[rocket]

thinks so, too, no skin. But, looks like on the first moment, nice find

[jpc]

exfoliated concretions.  Your last photo shows one in the act of exfoliating.... = peeling.  For whatever reasons, yours spall off little pieces of the outer layer leaving something that looks a bit like scaly skin.

[Callahan]

Ok thanks. What I figured.  Learned something new.  This is same site I found some saw tooth teeth and one vertebrae that some folks on here said was maybe a croc or plesiosaur etc. woodbine formation Arlington tx is location