About a cretaceous marine vertebrate? Algeria.

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Marc Philippe

no scale?

are sure this is no Ichnites?

regards

David Marjanović

This is not a vertebrate.

Mahdjoub Abdalhak

It's a Mosasaure tail.

It's too long, too narrow, too regular (where are the centra?), and doesn't seem to contain any bone.

Do you have a better photo? This one is a bit small.