Cretaceous fossils New Jersey

[Dino2033]

Hello all! 
Over the past few months I have gone down to Big Brook in New Jersey and found a few fossils that I do not quite know exactly what they are. I have a general idea on what a few may be.

 

1.

 

 

this tooth is about 1.5 cm long and had serrations on the small part of the remaining edge. I think it is probably mosasaur but it seems a little small. It also has a small curve in it.

2. 
Maybe the underside of a crab? Under a microscope it is very bumpy.

 

3. 

 Maybe a small scute?

 

4. 

small piece of deformed enamel from something?

 

 

5.

Huge shark tooth for this area. Maybe goblin but im not 100% sure and would like a little more certainty.

 

Thank you all! 

[ted coulianos]

Agree #2 is the ventral aspect of a crab; wide "apron" would indicate female, unsure as to genus or species.

[Al Dente]

9 hours ago, Dino2033 said:

Maybe the underside of a crab? Under a microscope it is very bumpy.

I think this is the carapace, not the underside.

[Al Dente]

10 hours ago, Dino2033 said:

Huge shark tooth for this area. Maybe goblin but im not 100% sure and would like a little more certainty.

It’s Scapanorhynchus texanus.