Do you think this is a carcass of a basking shark or something else?

Question

http://en.wikipedia.org/wiki/Zuiyo_Maru

i don't it look like something with fins and a reptilian head

Answer 1

It's a skinned walrus.

The rope is attached to the carcas at the hips... the head is lower left..  the tusks are still in the skull, [so it is young.. too young to be ivory tusked..]

the front apendages are still atached..  the hide is all thats missing...  more or less.

Answer 2

There's not enough showing in the photo to do any reasonable assessment to the species level.

Remember, however, rare things happen rarely; it is highly unlikely that it is a plesiosaur.  Extraordinary claims require extraordinary evidence.  The chances that any large animal species survives 64 million years is remote; the chances that a species survives 64 million years undetected is vanishingly small.  It is possible (the smaller the creature, the more likely), and it has happened occasionally (the Coelacanth being a notable instance), but it is very rare.

Answer 3

definately a fish jaw.. not sure if it's a basking shark persay, could be a whale shark or megamouth, etc

Answer 4

It looks like an octopus.