We would need further specimens and then check all of the literature which for that species is probably very extensive. And after all of this it would have a good likely hood of being rejected as too similar to the modern species.

Very interesting specimen in that it is a transitional form. Modern upper C. limbatus have fine serrations on the cusp. Earlier (prior to Miocene) Carcharhinids often have an unserrated cusps. This tooth has partial and incomplete serrations. New species’ names have often be determined on such minor details.

yes

Isurus oxyrinchus, 1st upper lateral

correct

Too damaged to ID further

Has serrations, but the image angle and the damage make it hard to ID. Possible Physogaleus symphyseal tooth but I am not anything close to sure.

Carcharhinus brachyurus Copper shark

It is correct

bottom picture left to right, jaw? as it has a hollow, could also be a limb, sea cow rib, whale rib, whale rib

Carcharocles chubutensis

Carcharocles megalodon

Carcharocles megalodon

Carcharocles megalodon

Carcharocles megalodon

Carcharocles megalodon

Carcharocles megalodon

Carcharocles chubutensis

Carcharocles chubutensis

Carcharocles megalodon