Plesiosaur or polychotylid jaw?

[Per Christian]

Here's a partial jaw for sale. Seller doesn't know where in Morocco it's from but it's listed as a plesiosaur jaw. Could it be plesiosaur? I wonder if it's croc

 

@pachy-pleuro-whatnot-odon

[Praefectus]

This is definitely a croc jaw. Location would help narrow down the identification. The preservation make me think it is from the phosphates, but I'm not super familiar with Kem Kem crocs and can't rule it out. 

[pachy-pleuro-whatnot-odon]

Like Trevor said: this is a crocodile jaw. Conservation and adhering matrix would indicate this as coming from the phosphates. The teeth, which have been added, however, look to be what would usually be called Elosuchus cherifiensis. It wouldn't be the first piece to mix material from different locations in Morocco. At the same time, it may be a good idea to have someone like @Troodon or @LordTrilobite have a look at it to rule out the jaw itself coming from the Kem Kem.

[Troodon]

A known Dyrosaurus from the phosphates of Morocco to compare against

 

Science Museum Minnesota

[pachy-pleuro-whatnot-odon]

2 hours ago, Troodon said:

A known Dyrosaurus from the phosphates of Morocco to compare against

 

Science Museum Minnesota

 

I agree, that's what I was thinking for the jaw as well. The preservation/colour of the teeth threw me off a bit, as most dyrosaurid teeth I've seen are light cream coloured, and they usually have a flattened lingual surface. However, looking back at the teeth, I think the teeth do match the identification. They do indeed not have the anastomosing enamel/durophagous adaptations you'd expect from Elosuchus cherifiensis.

 

I'd say, with that, jaw and teeth are both dyrosaurid - likely Dyrosaurus phosphaticus - from the Ouled Abdoun basin.

[Per Christian]

Thank you all, this was most informative 

[LordTrilobite]

I agree that it looks like a croc jaw from the phosphate beds.